Review: Geometron G1

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GeoMetron is essentially Chris Porter. If you don’t know who Chris Porter is, do a Google. Just make sure you have a brew ready before you dive in.

Essentially Porter is a suspension wizard who got so naffed off with mountain bikes having inappropriate geometry that he decided to make his own. He called his bike brand GeoMetron. He designs the frames; Nicolai manufactures them. That’s why there’s a big ‘N’ emblazoned on the head tube of this and the other GeoMetron models. Speaking of other GeoMetrons, there is no longer any mention of G13, G15 or G16 bikes. They’ve gone all-in on the G1. The G1, however, is something of a shapeshifter. More on this later.

So what was/is so wrong with mainstream mountain bike geometry? In Porter’s refreshingly and unashamedly Preacher Man world view, mountain bikes were too short. They had insufficient reach. They had insufficient wheelbases. They had head angles that were nowhere near slack enough. The GeoMetron G1 can be accused of none of these.

How do you say ‘GeoMetron’? The brand itself is coy about it, but there’s no way a brand fundamentally based on geometry is pronounced ‘gee-oh-met-tron’ is there? ‘Jom-atron’ all the way.

The Bike

Nicolai also makes a Nicolai G1 by the way. The launch of the G1 was executed by both brands back in 2019. There are some minor aesthetic and finishing touches that differentiate the Nicolai G1 from the GeoMetron G1, but it’s the exclusive use of EXT suspension dampers that is key. When you’re talking about a GeoMetron G1, you’re talking about EXT. Especially the EXT Storia V3 coil sprung rear shock.

Apropos of not a lot, this brand pairing reminds me of the partnership of Foes and Curnutt shocks back in the day. Just like you couldn’t really live with yourself if you got a Foes and didn’t get a Curnutt shock, it just feels wrong to get a G1 that doesn’t have a Storia. The Storia shock features a coil spring for the negative spring too, a top out pad and hydraulic bottom out control. An easily missed aspect of the Storia is that it’s mounted on spherical eyelet bearings. Think ball and socket. This reduces shock binding; the shock is freer to compress/extend irrespective of any lateral load forces going through the frame chassis at any time.

Regardless of what brand shock you want to go for, there is definitely a case for going with a coil shock instead of air due to the G1 having a relatively low leverage ratio at the start of the travel (coil shocks don’t need as much force to get them moving initially).

The G1 is a 162mm or 175mm travel enduro bike (travel is altered by a flip chip at the rearward shock mount). It uses a standard Horst-link design with the shock positioned horizontally (attached relatively far and high up the downtube). I tested the bike almost exclusively in the 162mm setting, mainly because the longer travel setting ramps up so progressively that little ol’ me struggled to get at that extra travel in regular trail riding.

A related aspect was also the choice of frame size to test. I went with a Large size, as opposed to an Extra Large. As ever, it was a question of priorities and riding preferences. The extra high-speed stability of the Extra Large would rarely be accessed by me so I went with the increased standover and low-mid speed manoeuvrability of the Large.

It’s worth pointing out that the G1 is adaptable. Via a whole system of ‘Mutators’ you can convert the bike to a full 29in wheel bike, as well as alter chainstay length, bottom bracket height, seat angle and head angle. This is a very reassuring aspect on such an expensive investment. You can be pretty sure your G1 won’t be outdated in five years. Or possibly even ten. Chris Porter’s Mondraker Dune from around ten years ago looks remarkably like the trail bikes we’re all riding around on today.

The GeoMetron G1 is made out of aluminium in Germany. And you either like the way it looks, or you love it. Personally, I’m not an all-out lover of the Teutonic alloy aesthetic but it is impossible to behold this bike and not be impressed by how well it is put together.

I’m not going to go too much into the build kit spec of the G1. GeoMetrons are almost always fairly bespoke. Neither am I going to go into too much about the G1’s geometry. Why? Because it may prejudice certain readers’ thoughts before I’ve even got to the important thing: how the G1 rides.

(Spoiler: you can read the spec and geometry details at the end of this review.)

It’s at this point where I try to sneak in the fact that it doesn’t have bottle bosses. Before riding a G1, I would genuinely have ruled out owning one because of this. After having ridden a G1… where did I put my CamelBak?

The Ride

Can I just write “best mountain bike I’ve ever ridden” and go home?



In many ways my verdict is both totally inevitable and wholly resented. I would love to be the child who points out that the Emperor has no clothes on. But I can’t. The Emperor is fully dressed and dressed exceptionally well. Yes, despite his Crocs (sorry, Mr Porter!)

Now, I’m not the first tragic bike journo fanboy to bang on about GeoMetron bikes. But I would like to be one of the few (first?) bike reviewers to compliment the G1 on how nice it is as a cross-country trail bike.

Sure, it will come as no surprise to anyone to hear that the G1 totally rules on descents. That’s kind of all you ever hear about them. You may even hear about how efficient it is on winching up steep fire road climbs (before sending it down the aforementioned descent). What you may not be aware of is that the G1 is really fun and just plain pleasant(!) to pedal around much more sedate terrain. It’s roomy. It’s supremely well balanced regarding bum-saddle pressure and hands-grips pressure.

And that Storia suspension? Genuinely freaking amazing. Cross-country firm under power. Supportive when cornering or ‘working’ the terrain, pumping free speed out of anything and everything. The G1 almost single-handedly makes the case that bike weight and amount of suspension travel are not mutually exclusive to efficient trail manners.

I’d quite ‘happily’ pilot the G1 around some sort of godawful cross-country marathon event around endless Welsh fire roads. It’s the comfiest and nicest mountain bike I’ve ever experienced.

The G1 gets so much macho blathering about how ‘capable’ and ‘aggressive’ it is, I’d just like to put my hand up and say it’s actually a really ‘friendly’ bike.

Not only is it friendly in a riding companion sense, it’s also as friendly as it gets in the workshop. It’s all external cabling (apart from the dropper routing up the seat tube), normal standards and decent sized bolt heads. There are steel inserts in threaded things. The pivot bearings are very well protected with secondary seals.

And when the terrain does eventually narrow and tip downwards? Fuggedaboutit.

To resort to vainglorious, humble-bragging anecdotes, on the first – the very first – ride on the GeoMetron G1, I finally rode something that I’d been eyeing up (and chickening out of) for years. JFDI. The G1 didn’t make me do it in a bullying or foolhardy way, it just felt like it would be okay. It was like that bit in The Matrix where Keanu realises he suddenly knows Kung Fu.

I’m honest enough to realise that I’d struggle to weight the front wheel properly if I’d opted to test an Extra Large G1. The Large here has a reach figure of 515mm, so is hardly short. If you’re a full-on speed charger who spends their rides with their chin in front of the stem faceplate, try a bigger one. I think there’s a lot to be said for being realistic and going with what the GeoMetron sizing chart recommends.

(Psst… On the larger size G1s I reckon you can bodge some sort of water bottle holder in the front triangle with a bit of cunning.)

The suspension design must get as much credit as the geometry for how much of an excellent all-rounder the G1 is. The anti-squat (just over 100% at sag) and the 30% progression in leverage ratio work really, really well with the Storia coil rear shock. The spherical eyelet bearings are definitely at play (pun intended) when the bike hits rough stuff at decent velocity. There’s noticeably less jarring or unpredictable bucking.

For what it’s worth, I didn’t visit GeoMetron HQ in person to do the whole ‘test ride and set-up masterclass’ thing. The G1 arrived at Singletrack HQ in a box and I dialled in the suspension settings that were recommended to me via email. I did try tweaking the settings a bit. Mainly out of professional courtesy/curiosity. I returned to the recommended settings pretty quickly.


The GeoMetron G1 is the best mountain bike I’ve ever ridden. It will never win a cross-country race but, then again, neither will I. Nor do I want to. Cross-country races are (still) won by those who can climb the fastest. That’s not what I’m about. I want to ride a bike around everywhere and anywhere and never feel ill-equipped or ill at ease.

Any niggles? It’s expensive. But, for once, it feels like the expense is understandable. For the most part. I’m also not sure the EXT fork is any better than other forks costing half as much (which are still flipping expensive). On the whole though, the G1 offers a ride experience that I don’t think is currently available anywhere else.

The G1 is fun, efficient, comfortable, exciting, relaxing, grippy, nimble, planted, capable, reassuring, predictable and pretty much amazing. And most significantly, unique. Mainstream mountain bikes are going to be sooo good in 2032. You’re essentially paying for a time machine here.

Geometron G1 Specification

  • Frame // Aluminium, 162mm
  • Shock // EXT Storia V3, 230x65mm
  • Fork // EXT Era, 160mm, 44mm offset
  • Wheels // Hope Pro 40 Fortus
  • Front Tyre // Schwalbe Magic Mary, 29 x 2.4in Super Gravity Ultra Soft
  • Rear Tyre // Schwalbe Big Betty, 29 x 2.4in Super Gravity Soft
  • Chainset // Hope Evo, 170mm, 32T
  • Drivetrain // SRAM AXS GX
  • Brakes // Formula Cura 4, 203mm/180mm
  • Stem // Hope AM 35mm
  • Bars // Renthal Fatbar 35
  • Grips // ODI Elite Pro
  • Seatpost // BikeYoke Revive 213mm
  • Saddle // WTB Volt
  • BB // Hope
  • Size Tested // Large
  • Sizes Available // S, M, L, XL, XXL
  • Weight // 16.55kg

Geometry For Our Size L Test Bike

  • Head angle // 62.5°
  • Effective seat angle // 78.75°
  • Seat tube length // 455mm
  • Head tube length // 130mm
  • Chainstay // 453mm
  • Wheelbase // 1,324mm
  • Effective top tube // 642mm
  • BB height // 330mm
  • Reach // 515mm

Review Info

Brand: Geometron
Product: G1
From: Geometron Bikes
Price: £6,700
Tested: by Benji for 2 months

Orange Switch 6er. Stif Squatcher. Schwalbe Magic Mary Purple Addix front. Maxxis DHR II 3C MaxxTerra rear. Coil fan. Ebikes are not evil. I have been a writer for nigh on 20 years, a photographer for 25 years and a mountain biker for 30 years. I have written countless magazine and website features and route guides for the UK mountain bike press, most notably for the esteemed and highly regarded Singletrackworld. Although I am a Lancastrian, I freely admit that West Yorkshire is my favourite place to ride. Rarely a week goes by without me riding and exploring the South Pennines.

More posts from Ben

Viewing 21 posts - 1 through 21 (of 21 total)
  • Review: Geometron G1
  • sharkattack
    Full Member

    I really didn’t need to read this because I already want one.

    What you may not be aware of is that the G1 is really fun and just plain pleasant(!) to pedal around much more sedate terrain. It’s roomy. It’s supremely well balanced regarding bum-saddle pressure and hands-grips pressure.

    That’s what I used to tell people about my G16. It’s just a really nice, comfortable place to sit and spin your legs so it makes big days out much easier. You don’t have to be red lining it everywhere to feel the benefit of good geometry.

    Full Member

    It’s great the review covers one area of the bike which could put people off – I want one but (like many others) had thoughts about whether the bike would be too much unless it was charging downhill over extreme gnar, which everyone knows it’s great at.

    That ability to be great at all things, plus the durability built into the frame, not only with the build quality but with almost every thread being replaceable, and the adaptability with 29/27.5, 175/160mm options (and soon to be a 140mm option), and there’s nothing out there on the market that compares.

    Free Member

    hmmm, a G1, deviate claymore or hope HB916? which would you get?

    Full Member

    hmmm, a G1, deviate claymore or hope HB916? which would you get?

    If the Claymore was available in alloy I’d have a much harder choice, as it I want to move away from a carbon frame so the G1 is the only option.

    I’ve not had any failures or issues with my carbon Jeffsy over the past 3 years but it’s nice not having to worry when you get potato sized rocks clonking off the downtube.

    Full Member

    After 5 years on my G13 I’d suggest a Geometron.

    I’d like a G1, but the G13 is good enough everywhere for me that the extra travel looks unessesary

    Free Member

    Honestly my G1 is the last non E Bike I’ll ever buy. For me there’s just no reason to have another one that doesn’t include a motor. I really can’t fault it. The help and support you get from the guys at their HQ is amazing too.

    Full Member

    Had g1 for nearly 2 years now and from time to time I do wonder whether a reach of 495mm is a bit extreme for my 5’8″, and then I ride it again (don’t ride enough these days) and I realise that it just works so well.

    Truly a great bike that is subject to so much prejudice from keyboard warriors – great review Benji.

    Full Member

    I’m nearly a full year on my G15 and still subject to friendly ridicule on group rides – well, I think it’s bike-related ridicule and not character assassination.

    It just feels ‘right’ riding this after years of riding so-called ‘XL’ sized bikes previously. I’ve not ridden a G1 as I’m scared I’ll like it enough to want to swap, and I’m not ready to!

    Full Member

    these are starting to peak my interest! @sargey2003 & @tetrode – did you demo one before buying?

    What did you come from and what made you go with the G1?

    Full Member

    I did a demo at Geometron HQ of a mullet in medium. I was riding a medium Bird Aeris 145LT up until then (which is a fine bike itself) – I did a lap of the Geometron local loop and then rode the same loop on the Bird (with demo EXT Storia shock) – and I was shocked by how much harder it was on my regular bike having already seen the trail. Suddenly a bike with a reach of 455mm felt far too small.

    I bought a frameset within weeks…

    Well worth a demo, they will spend a lot of time with you.

    Free Member

    @v7fmp I also did a demo at their HQ. I’m local to the area so it was easy for me to head over. Sam and Marcel got me set up on the right size bike and did all the initial setup, watched me ride around the car park and gave some advice before we did some laps of the trails around the Doward.

    I came from a large 27.5 Jeffsy, went to a full 29 G1 large so it was quite a change but I had been eyeing up more slack aggressive bikes for a while. I went with the G1 in the end for a few reasons. I booked a demo with them at first because a couple of riding buddies from a local group had them and could not sing their praises enough, having gone through multiple different bikes before landing and staying on the G1. Their praise for it, as well as the demo day, the fact that they’re a local company, their customer service and help, and the value (yes it is good value compared to other bikes of the same cost) made me go for it. It was cool to have a bike completely set up how I wanted it, and I like the fact that I’m running Formula forks and EXT shock which isn’t that common.

    Plus having it now for just over a year my riding has improved so much, from the confidence it gives me and the change in riding style it requires.

    Full Member

    I was ‘this’ close a 20mths ago to buying a G1, as one of the few bikes that work well for a truly tall, and truly heavy, bloke.

    Went with Pole Evolink in the end, as it was about 1/2 the price frame only as there was a sale at Pole. TBF, the Pole has been spectacular. Amazing bike, still riding it a lot and there have been no issues with the frame itself (although the RS plus shock shat itself, but was warranty replaced instantly).

    Benji’s review, and all the comments here, are massively unhelpful. Please stop. Thanks! 😉

    Full Member

    The reliability of a bike is super important to me, had a few frames over the years which had issues, some were quickly sorted and some took an age (and were a fault by design) to fix.

    The G1 has been faultless in the 18months I’ve had it, its done 2000miles and 500,000ft of descending, its wanted a set of chainstay bearings and main pivot bearings in that time, and thats it, still haven’t had the shock serviced either.
    Can set it up for local xc with a change of wheels and a bit more low speed, set it up for uplift days with more travel or somewhere in between. On the lookout for a set of boxxers, will probably end up buying the new ones when they come out.

    Its the last non eeeb I’ll ever buy, it doesn’t get ridden as much now I have a kenevo sl, (which is basically a G1 with a motor), but when I do ride it, its quite the machine, silent and easy to ride quickly.

    Full Member

    cheers for the feedback @sargey2003 & @tetrode and for your input @SirHC.

    Is the G1 your only bike (apart from your Kenevo SirHC)? And are you happy to take it on XC bimbles to the gnarliest of gnar?

    Living on the south coast, we dont have much in the way of steep gnar, hence why i enjoy my Norco Optic so much, so dont want to be overbiked for most of my riding, only to get the benefits a couple of times a year…??

    certainly sounds like i need to book a test ride at the HQ and take one for a spin!

    Full Member

    @v7fmp you might be interested in the G1ST kit that’s meant to be on the way, they were looking at their own custom version of the Saturn 16 for something shorter travel but seem to have decided to go with a kit that takes the G1 down to 140r/150f travel, that along with a lightish wheelset and trail tyres and you have yourself a trail bike.

    I’ll be building mine with 160/170mm, 37mm mezzer pro forks, and supergravity tyres – which is probably a bit overkill for bedgebury or my local North downs here in the SE 🤣 I also have a hardtail for that sort of riding through.

    Full Member

    @ta11pau1 – that does sound interesting and probably much more up my street. I would assume you can swap some bits out and make it long travel again for trips abroad etc.

    I will give them a shout to see when it might see the light of day.

    I also have a hardtail, which would compliment a G1 far better than the short travel Optic i currently have (which i might add, i totally love, so it might be hard work to actually part with it)

    Full Member

    Keep an eye on the Geometron Facebook page for any updates.

    And yeah, with the ST kit (and probably a swap of chain/seat stay mutators) the frame could be set up as 140, 160 or 175 rear – then it’ll take anything from a 150mm trail fork up to a 180mm dual crown. Not forgetting the 27.5 and 29 options…

    Free Member

    Is the G1 your only bike (apart from your Kenevo SirHC)? And are you happy to take it on XC bimbles to the gnarliest of gnar?

    Living on the south coast, we dont have much in the way of steep gnar, hence why i enjoy my Norco Optic so much, so dont want to be overbiked for most of my riding, only to get the benefits a couple of times a year…??

    Yeah the G1 is my only MTB, and I’ve taken it on 50km xc routes around the FOD (wild boar chase etc) and it’s fine for those.

    Most of my riding is on the same trails it was designed for though, steep, chunky, off piste kind of stuff so I would say that if most of your riding is not around that kind of stuff, you may not get the most out of it. Sounds like a shorter travel bike is best suited for your riding but worth keeping an eye on the G1ST.

    Full Member

    Great review! What height are you to go for a large?

    Full Member

    I originally built up the G1 with lyriks and lighter tyres, as at the time I had a hardtail as my other bike. 2nd wheelset I’d take it out when the hardtail wasn’t appealing. Its no xc whippet, but pedals really well for what it is.

    I’m lucky enough that I have a 2022 stumpjumper (the one with flex rear stays) for local xc, have ridden on tamer trails, its great for that stuff, but when its fast/rough, I’m too use to big enduro bikes now.

    There is a G1ST, Nicolai release the S1, but it didn’t offer what the Geometron people wanted:

    Free Member

    I’ve got one as my only bike, although kids/life have got in the way a bit too much lately to ride it much! I’m very happy with it. I tend to ride round the Midlands, and get over to Shropshire when I can.
    My initial concern was also whether it could be ridden on more mellow stuff, and when I went on my test ride they took me on a loop of that kind of riding. I thought it coped very well (so bought one) – the rear drifts so nicely because the length of the bike gives you more time to balance it. That’s a lot of fun and the main reason I bought it. It is a big bike and it excels in steep and off piste riding, but that isn’t all it can do…
    You can’t completely hide the weight though, and if you just loop trail centres you might be better off elsewhere? It will ride nicely, but it will smooth out all the bumps and it’s best when you’re riding quickly – if you like to ride in a lazy style (nothing wrong with that!) it may make everything a bit tame. Get it up to speed though (and that’s not necessarily as high as you’re imagining) and it’s good fun. Oh, and if you’re weaving through tight trees all the time it might frustrate you… It is well worth the test ride to find out.
    My favourite thing about it though was that I felt different riding that bike than anything else – I felt like I was low and ‘in’ the bike rather than on top of it. It felt very natural to ride and I helped with it very quickly. For reference I’m 6’2 and previously came off an Ibis Mojo HD3 (which I loved until it was stolen)…
    In short, if you’re mildly interested do a test ride with Mojo. It’s worth it, either to realise what you’ve been missing or to avoid an expensive mistake! I think that all the taller riders out there may be pleasantly surprised by it though!

Viewing 21 posts - 1 through 21 (of 21 total)

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