Home Forums Bike Forum 26″ MTB to 650B gravel – Is it a good idea?

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  • 26″ MTB to 650B gravel – Is it a good idea?
  • belgianwaffle1
    Full Member

    Every time I go into the shed I look at the 26″ MTB frame that’s now too small for me and wonder if I could turn it into a gravel bike. The obvious choice for saving money is to put 27.5 wheels, thinner tyres and wang together a drivetrain.

    Has anyone done this and created something that felt correct? A bike that they really wanted to ride?

    FunkyDunc
    Free Member

    I don’t get why you would want to do that, the point of a gravel bike (apart from marketing BS) is to get you going faster on erm smooth gravel, basically on a road bike.

    An mtb will be slower and IMO less comfortable

    ampthill
    Full Member

    I’d day it’s a good plan provided you can get 50mm tyres in. Then maybe some loop bars or Mary bars for a few hand options

    Loving my Rutland teravail as a fast road tyre

    belgianwaffle1
    Full Member

    @ampthill yes it looks like I can get 50mms in there which was what I was hoping.

    belgianwaffle1
    Full Member

    @FunkyDunc I guess the main reason would be to have a bike that could do rides with all types of terrian – especially ones which have road sections in the middle which would be tiresome on a 26er with suspension.

    montgomery
    Free Member

    Yep. Two days ago:


    Built it up just as Covid hit, based around an old XL 26″ Lava Dome frame, some Surly forks, and 650b wheels bought on here for £60.

    Now 1×11 with similar gear range courtesy of a Microshift bar end shifter and Deore 11-51 cassette. It actually rides better with wide flared drops than it did as a conventional MTB.

    I really like it, a comfy mile muncher built on the cheap. The only weak spot is the Spyre brakes that were a cheap initial solution to get road and MTB stuff to work together. At some point I’ll be going hydraulic, various ways I might do that.

    montgomery
    Free Member

    On that Friday ride, after the outward leg over gravel/forestry tracks and mountain single-track, I returned on tarmac over the Devil’s Elbow. Did it all fine (can’t link the DE hill climb for some reason, but you’ll find it easy enough).

    belgianwaffle1
    Full Member

    @montgomery thanks for the info mate, was the frame already too small for you before you converted it?

    robgclarkson
    Free Member

    I did something similar to a 26″ yeti arc frame, put 27.5″ wheels on there and geo corrected 100mm travel (26″) rigid fork…. thing bloody flies I tell thi

    arc 26

    Yes it feels correct… yes I really want to ride it… and do, regularly.. not tried drop bars on it mind

    p7eaven
    Free Member

    Every time I go into the shed I look at the 26″ MTB frame that’s now too small for me and wonder if I could turn it into a gravel bike.

    I bought a 29er gravelbike/monstercross and later discovered the frame was too small for me. I’d say begin with the right size frame? (I know it needs shorter reach for drop bars, so might be OK)

    montgomery
    Free Member

    I’m 6’4″, all 26″ frames are too small for me. Doesn’t bother me, takes the guesswork out of frame size ordering. I just alter the controls to fit. With that Lava Dome frame, the front end tended to lift badly on climbs in MTB guise (Mary bars, 100mm stem). Less badly with subsequent loop bars, but now much better with weight forward on Redshift gravel bars. Is it better than a stock gravel bike? Dunno, never ridden one, but I like fettling and adapting existing kit.

    gowerboy
    Full Member

    I guess that if a frame is on the small side it means that the reach is probably relatively short for you too… which makes a conversion to drops more successful?

    rOcKeTdOg
    Full Member

    point of a gravel bike (apart from marketing BS) is to get you going faster on erm smooth gravel, basically on a road bike

    That’s what a road bike is for, the gravel bike is for making MTB trails that have gotten boring on super efficient MTBs entertaining again. There’s hardly any “smooth gravel” in the UK. The marketing BS you’re believing is coming out of the USA & just like MTBing here is different to the US then so is Gravel biking

    tonyg2003
    Full Member

    Yep 650b wheels with gravel tyres work well on old 26” MTB. Although you probably need a rigid front fork to get enough tyre clearance to make it work. My old Orange HT (2007) works great as a gravel MTB.

    Stainypants
    Full Member

    Ive done this twice once with an old kinesis decade and I’m just finished off building up an old Scandal with 650b wheels and 2 inch tyres yesterday. I’m into flat barred gravel bikes and I’ve just built a fancy carbon one but I wanted something for really crappy days and for bikepacking that I could strap loads of bags to without worrying about trashing it. I wasn’t going to put 650b on it but I needed to steal the rear 26 inch wheel off the scandal for my daughters bike so I thought I’d give it a go and I was surprised it’s fitted in the rear with 2 inch tyres on. It’s not really a gravel bike it’s a rigid mtb what matters is it does job I want it too.

    Here’s the kinesis before I crashed it

    The bar ends replicate the hood position on my dropped barred bike.

    belgianwaffle1
    Full Member

    Ok thanks all – one last question. Should I buy a fork that is corrected for 100mm for 26″ or for 650B?

    tomparkin
    Full Member

    I have a short 26er frame I keep musing on doing up like this but the sticking point is always brakes.

    Ideally I think it wants drop bars as the reach is a bit titchy. But if I do that I need to buy new brakes which takes it from “interesting hack” to “this is expensive enough that it Has To Work”.

    benz
    Free Member

    Years back, I pulled a 26″ wheel Fisher Marlin mtb frame from the local skip. It lay in the back of the shed gathering dust along with other bits and pieces.

    However, after a visit to our local powder-coater, it is now a frankengravelesque 69’er (using Exotic rigid carbon forks) with flared drop bars, USE suspension post, Shimano mechanical disc brakes and 1 x 11 drivetrain with Microshift bar-end shifter. With 2″ Vittoria AKA tyres on it, it rolls pretty nicely and rides well. I built it up for exploring local tracks and also broader old disused railway network. Pannier rack being fitted this week to support luggage carrying too.

    I would post pics if I knew how to. If anyone wants to do so on my behalf, happy to send a pic to them.

    wbo
    Free Member

    Fork – one that’s corrected for 26 makes sense to me as if it’s the 650B + correction won’t it lift the front end. Probably not the end of the world tho’.

    How small is this small frame you talk of?

    belgianwaffle1
    Full Member

    @wbo

    Just measured the frame, it has a 17 inch seattube. I actually had it with a rigid fork in its last iteration:

    biky

    but unfortunately on the same ride I took that photo I slammed into a log and broke the carbon fork, so it has been sitting ever since. Pictured it had 2.35 tyres on, so the wheel size converter tells me I could get away with 47mm in 650b flavour.

    highlandman
    Free Member

    I’ve done this (sort of..) with our 26″ MTB tandem frame.
    Kept the rigid 26″ fork and it now runs 650b wheels with 42mm gravel tyres, although slightly bigger would probably still fit if I wanted to try them. Definitely rolls along better now than it did when it had some 26×2.0 slicks on it. It gets used for some touring and the occasional bit of mild off-road. The only real disadvantage is not being able to squeeze in a proper front mudguard.

    FOG
    Full Member

    I used 700c wheels and a 100mm corrected 26″rigid fork in my old Soul. It works fine, much better than I expected. It was always a bit small for me and benefits from longer stem. I still used riser bars and bar ends but will probably get drops when I can afford hydraulics, cable discs are the work of the Devil

    JonEdwards
    Free Member

    https://www.instagram.com/p/B_fFklrnV7r/?utm_source=ig_web_copy_link

    I did this a few years back with my 26″ Soda. Rigid Exotic carbon forks, 650bx47 wheels & tyres, flat bars and barends inboard of the grips like Stainypants.

    It was a lot of fun. Gave away very little on road to “proper” gravel bikes and could be chucked around offroad reasonably well. Being a light, top notch, frame to start with, it climbed like a freshly ravished goat and the acceleration was phenominal.

    I’ve now got a “proper” gravel bike in the form of a Genesis Fugio. This corners better thanks to a much lower BB and however it works – its MUCH more forgiving on my wrists than the combination of flat bars and the Exotic fork were. Its not as good a climber as the Soda (higher front end), but deals with luggage much better. Whilst it descends nicely, overall its a much more staid ride than the Soda and a year on I still miss the sheer zip that had and I’m seriously considering spunking a load of cash on a Ti gravel frame…

    lorax
    Full Member

    Having just rejuvenated my old singlespeed Inbred with a rigid carbon fork I like this idea for the ancient geared Inbred frame I’ve got sitting in the shed! Does anyone know if 650B wheels with big(ish) tyres will fit in the back of an Inbred? Having just eyeballed it there doesn’t look to be a lot of space at the back, so I may be better with 2.3s on 26″ wheels, but if I can get fit 650Bs in there I might look out for some.

    intheborders
    Free Member

    That’s what a road bike is for, the gravel bike is for making MTB trails that have gotten boring on super efficient MTBs entertaining again. There’s hardly any “smooth gravel” in the UK. The marketing BS you’re believing is coming out of the USA & just like MTBing here is different to the US then so is Gravel biking

    Maybe where you live, but not where I live (Scotland).

    tomparkin
    Full Member

    I have a short 26er frame I keep musing on doing up like this but the sticking point is always brakes.

    Ideally I think it wants drop bars as the reach is a bit titchy. But if I do that I need to buy new brakes which takes it from “interesting hack” to “this is expensive enough that it Has To Work”.

    Responding to myself is possible bad form but I just discovered (thanks the thecyclopath on Instagram) that the Surly Corner Bar is basically drops with MTB control compatibility.

    They’re a bit spendy and will need either a new stem or shims to work with 31.8mm but probably less faff than trying to find new brakes.

    Rivett
    Free Member

    Yes, have done this with an old Cove frame. 650b Stans rims, 40mm WTB tyres and Easton drop bars. Put a 20mm shorter stem on to allow for running drops. The costly part was shifters, brakes. Running 1 x 11 so managed to set the L/H side up to activate the fork (100mm Rebas) lockout.

    alcolepone
    Free Member

    Can anyone recommend a good rigid fork for a 26inch wheel’d frame? very tempted to finally get around to converting a 2005 Specialized rockhopper,

    bike

    the frame is pretty light, so i think could be a good contender. to make a nice change, i’d like to try drop bars on it, is that tricky to setup, i presume new brakes and shifters are required?

    montgomery
    Free Member

    There are some in that Evans sale atm for £80, 450mm AC, which would be about right for a frame of that age.

    Stainypants
    Full Member

    @intheborders I live in Cheshire and I have multiple all-day gravel rides > 80% off-road from my house and even more a short car drive away.


    @Tomparkin
    Those Surely bars weigh about the same as a small planet.

    I have had drop bared gravel bikes since 2014 and for the riding, I do I never use the drops. For me, the flat bar combined with in-board bar ends is the optimal configuration giving a hoods position plus greater control on descents and easier access to a greater gear range. I’ll stick some photos of my new bike in a new thread and get shot down for building a hybrid.

    Here’s my Scandal finished apologies for the soup cans, this is as I said for riding in winter and maybe touring the only thing I’m not too happy with is how low the front end is as the steerer is cut short.

    BadlyWiredDog
    Full Member

    I’ll stick some photos of my new bike in a new thread and get shot down for building a hybrid.

    I wouldn’t worry, that’s not a hybrid, it’s a rigid 650b mountain bike with misplaced bar-ends 🙂

    Stainypants
    Full Member

    @BadlyWiredDog It’s not the Scandal I was talking about. I’ve built two bikes recently, I know what the bike above is and I said exactly what you said in a post earlier. However, it will get ridden on exactly the same trails as I ride my gravel bike when the weather is crap and just a bit slower.

    benz
    Free Member

    Folks,

    If anyone wants to go rigid on the front, drop me a message.

    I have some newly powder coated Singular steel qr rigid 29’er forks plus full carbon rigid 26″ fork lying gathering dust in the shed… Both are straight 1.1/8″ steerer.

    lorax
    Full Member

    @benz – DM sent about the 26″ forks

    sillysilly
    Free Member

    Don’t bother.

    If you want to go on long or fast rides on road / gravel then get a gravel specific frame or bike.

    Otherwise you will pay £££ for:

    Drop bars
    Stem
    Shifters & callipers
    Bar tape
    Rigid fork
    Tyres / potentially wheels & tyres
    New cables and other parts bodging a group set together

    You will then get stuck with a bike that is too long with janky geo, too heavy, small wheels and not that fast in comparison to a decent carbon gravel bike.

    Fine for a pootle but not good for a 3-4hr ride.

    Can tell you from bitter experience trying to gravel up my Zaskar frame. It did look very nice though… Now rolling on carbon bike I picked sh for just over £400 that is miles better.

    belgianwaffle1
    Full Member

    Anyone know if you can use a 9 speed mtb derailleur with 10 speed mtb cassette? Both Shimano.

    Stainypants
    Full Member

    You can if you are using older 10 speed Shimano drop bar shifters but not current Tiara or grx.

    belgianwaffle1
    Full Member

    Ok thanks @Stainypants I am using a 5700 groupset so should be fine as they are 2011 release date.

    jwt
    Free Member

    This has me thinking about a 26″ wheel 4-5-6 that would potentially see more use as a gravel bike……………..

    Stainypants
    Full Member

    @belgianwaffle1. They will be fine I’ve used those with an 9 speed XT mech and an 11-36 XT cassette with no probs.

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