What is the point of dual chainrings ?

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  • What is the point of dual chainrings ?
  • mikewsmith
    Member

    Haven’t we finished this one by now.

    People use them because they are practical, some people don’t and others only have 1 ring…..

    Does the OP have an answer??

    Double and bash. Never used the big ring and they just get damaged.

    That’s another thing… If you’re in the big ring, and whack it against something, the chain tends to slide over whatever you hit.

    Having said all this, my next bike will be bigger and bouncier, and probably have a double and bash. After all, I think I would hate anything with a high BB. I could probably live with 22/38.

    Dibbs
    Member

    I’ve just got back from a ride on the Quantocks using 36/46 on the front and 12/24 ten speed on the back, just have to choose your route a bit more carefully. πŸ™„

    Bikewhispers – if yo have no big ring you are less likely to hit it – and a bashring or 36 ring with the chain on it does the same

    Premier Icon cynic-al
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    I tried a double, looked well ‘ard but I was shifting a the front more (on a 36) which I found a PITA…and otherwise I found no benefit.

    Premier Icon Northwind
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    scu98rkr – Member

    Yes, but having a triple opens up a much larger range of gears than a 2*9 or a 2*10.

    It really doesn’t. IIRC I lost the top 2-and-a-half gears. You know, those ones you never use offroad unless you’re riding something gobsmackingly dull.

    B.A.Nana
    Member

    In addition to the usual reasons, anyone who rides leftie usually ends up with loads of chain ring wounds, as their right legs (chain ring side) is the one they put down first, kick off with and balance with. Getting rid of the big ring pretty much eliminates bloodied leg. If you’re right foot forward it’s not such as big an issue.

    glenh
    Member

    I use the big ring off road all the time, even on technical stuff.

    You guys really need to MTFU.

    Premier Icon Northwind
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    glenh – Member

    I use the big ring off road all the time,

    Do you use those top 2 gears? Those are the only 2 not replicated on a 36T “middle”

    Premier Icon njee20
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    Here we go Juan, feel free to get involved…

    I always found a 22t too small to be of use and a 44t too big. So something in the middle was perfect. 28/40 was nice.

    Did it originally by just taking off the granny – forces one to MTFU in races a bit, still had a 1:1 bottom gear.

    Not for everyone though, some folk enjoy/need a 22 etc etc. 1×10 now, and that’s even better.

    Spin
    Member

    Can’t be arsed reading the whole thread but here’s my 2 cents.

    I ride double and bash (22/32 I think) so no weight saving over a triple. I find it gives the right ratios for riding in yer actual mountains i.e. a tiny gear for massive ascents and something big enough for the kind of downs you find in the big hills – mainly techy and so not too fast. No need for a big un as you won’t be bombing it and you can freewheel if you need to. Judging from the state of the bash ring it’s doing it’s job. Never once wished for the big ring since I got rid of it.

    Horses for Courses innit?

    Premier Icon DezB
    Subscriber

    I use the big ring on bumpy fast stuff. Tensions the chain and stops it jumping off. Sorry to not follow fashion, but I’m not changing my setup until I need to.

    (excuse me while I fit this 50mm stem, 750mm bars and flat pedals to my new frame I had to buy cos everyone said I needed a tapered steerer. And now my new front wheel, oh, and forks because I must use a 15mm dropout fork of course. Then I just have to get this 10 speed rear mech on. F-me, you lot must have money to burn staying with the trends)

    B.A.Nana
    Member

    DebZ having a moment there πŸ˜‰

    scu98rkr
    Member

    I think alot of you are missing my point.

    Im not asking what the advantage of smaller front chain rings are. I agree with all of them. I also agree we could probably get away with a smaller range of gears.

    Im asking what the advantage of a double.

    If you have a front gear mech why not stick in a third chain ring .

    Say this XT model

    http://www.chainreactioncycles.com/Models.aspx?ModelID=67200

    it has a 28-4O T model why not just bung in a 22 tooth ring as well.

    it would hardly weigh anything.

    kudos100
    Member

    Im asking what the advantage of a double.

    Chain doesn’t come off as much. End of.

    Premier Icon Northwind
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    scu98rkr – Member

    If you have a front gear mech why not stick in a third chain ring .

    This has been answered πŸ˜• it adds almost nothing, it takes away ground clearance, sometimes adds weight, and assuming you’re going up gears also requires more chain, which means more chainslapping and less good chain control in general in the lower gears- ie worse shifting, more noise, more dropped chains. And another part to buy and maintain. In theory a double can give you better chainline too though in practice I’m not sure how often this happens.

    superfli
    Member

    With Kudos100. Only reason I have just changed is for the chain device.

    Bashguard is required to allow the screws to tighten, I personally cannot remember the last time I hit my big chainrng on an obstacle.

    scu98rkr
    Member

    This has been answered it adds almost nothing, it takes away ground clearance, sometimes adds weight, and assuming you’re going up gears also requires more chain, which means more chainslapping and less good chain control in general in the lower gears- ie worse shifting, more noise, more dropped chains. And another part to buy and maintain. In theory a double can give you better chainline too though in practice I’m not sure how often this happens

    im not on about adding a big chainring im on about adding a small one.

    ok chainline and q factor are valid oints.

    B.A.Nana
    Member

    Bashguard is required to allow the screws to tighten,

    EH?

    ahwiles
    Member

    im not on about adding a big chainring im on about adding a small one.

    smaller than a 26t?

    eh?

    πŸ˜•

    Premier Icon chakaping
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    You know, those ones you never use offroad unless you’re riding something gobsmackingly dull.

    I get mildly annoyed when people say this about having a big ring.

    Sometimes I have to ride open fast bits or even tarmac before or after the sort of techy gnar shreddage that I presume makes up 100% of your riding.

    I make do with the 36t ring on my double and bash, but I’ll admit I would like my old 44t big ring from time to time.

    Premier Icon DezB
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    DebZ having a moment there

    πŸ˜†

    bash ring, less chain, short cage πŸ™‚

    scu98rkr
    Member

    yeah then u would nt need a silly heavy 1O seed cassette out the back and 8 seed or something would do saving weight escially out the back. and meaning u dont damage your hubs so easy

    I took my big ring off as it only used to rip my kecks or my leg. Also, if I twonked it into a rock or log it would bend and could spoil my flow by making me stop to sort it out.

    Now all my mountain bikes have bash rings and 2 rings.

    I hardly ever used my big ring anyway. it ain’t that flat where I go.

    Premier Icon Northwind
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    superfli – Member

    Bashguard is required to allow the screws to tighten

    What?

    Spin
    Member

    8 seed or something

    This idea is growing on me…

    Premier Icon Northwind
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    Apologies Chakaping- should have said “Never need” rather than “never use”.

    Premier Icon seosamh77
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    As someone who has always had a triple. I do find myself thinking, what is the point of the big chain ring? When i’m going fast enough to spinout on the middle ring, i’m happy at that speed, no need to go any faster. I usually just glide and let gravity do it’s work.

    bm0p700f
    Member

    I cannot see the point in triple chainsets anymore. I never use the granny ring on the one MTB that still has one (the other two are SS so it is untlerly pointless. Even in Wales I was always in the middle ring up the steep gradients.

    2×9 or 2×10 with 22/38T matched to 11-32 casstte is all you will ever need. If you need a lower gear than 22/32 you are not trying hard enough and it will be quicker to get of and pick up the bike and walk.

    Premier Icon Northwind
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    I do think triples have their place tbh… But I see it as being the same as single ring- something that a minority of people will benefit from. The default ought to be doubles for mountain bikes IMO.

    superfli
    Member

    I couldn’t tighten the middle ring screws without some sort of spacer. So bash ring filled the gap.

    james
    Member

    “22+30+38 you could probably get away with having 7 or 8 gears on the back 11-30 this should be plenty for most situations”

    22-34T is an extra gear over 22-30T, I use this bottom gear a fair bit on steep(er) hills, either at the end of a longer ride when I’m on my arse, when its really really steep and/or when I want to be able to spin fairly fast (rather than grind away) over the rough
    Re: its quicker to walk, spinning quite fast in 22-34T is faster than walking IME, plus I went for a bike ride, not a walk with my bike
    Only times I’ve really really wanted higher than a 32T chainring on FS bike has been on road downs (good bits but still). I’d like a 36T so I’m not using the smallest end of the casette so often and spinny, but I don’t really want the 14T jump between 22>36T tbh, I’d be losing 32-34T which is quite useful for up-down-up-down-up-down trails where I’m up and down the casette

    “You can get an 11-36 10spd cassette for ~200g if you really want, which is lighter than nearly (or possibly all) 9spd full sized “
    Yes, but how much does an XX 10spd 11-36T casette cost?

    “you use it downhill the chain has more tension so rattles against the stay less”
    I used to do this, I often found I ended up with the chain halfway (or further) up the casette, the chainline then not only was less efficient, it very often pulled the chain off the big chainring over the rough.
    I found within 6 months of fitting new outer chainrings (which I stopped using since shimano figured how to make (middle) chainrings that aren’t made of cheese (since SLX came out) I’d worn the teeth so badly the chain wouldn’t stay on it.
    2*9 + medium cage mech + shorter chain suprised me how much less my chain falls from middle to granny ring (And then off and jamming against a frame pivot). Its pretty much never now

    Mech hitting chainstay? A Shadow mech gets round that IME
    (Or chain slapping chainstay?)

    “Bashguard is required to allow the screws to tighten”
    Not if you use short ones?

    Premier Icon cookeaa
    Subscriber

    “22+30+38 you could probably get away with having 7 or 8 gears on the back 11-30 this should be plenty for most situations”

    Yep 8 speed 11-30 here with a 22/36 double as quite honestly your proposed triple would be pretty pointless
    the whole reason for a double with 14T difference between granny and big ring is that the granny is really just the winching gear…

    80%+ of your riding will be done in the bigger ring don’t think of it as a double think of it as a 1xn drivetrain with an emergency bailout granny ring…

    Triples are toss

    I’m waiting for Hope to pull their finger out and deliver the promised 9-36 cassette that’s when 1×10 really starts to look like a goer to me, as discussed elsewhere today then you can run a smaller ring (30 or 29T) have a ~22″ climbing gear and still get the same Grrrr gear as an 36-11 (~85″) no duplication and one less shifter to clutter the bars, win/win I reckon… Now lets see it in the shops please…

    dyl
    Member

    RestlessNative – Member
    on the flip side what is the point of a big ring unless you only have dull fire roads to ride?

    I suppose some people live in houses that are already off-road so they don’t have to cycle along roads to get there, but I unfortunately do live on a road, so I have to cycle along it to get to the off-road.

    HTH πŸ™‚

    Premier Icon njee20
    Subscriber

    it has a 28-4O T model why not just bung in a 22 tooth ring as well.

    Because not everyone finds any use in a 22. By having 2 the chainline is far better too, so you can use the full cassette in both rings, so don’t have to worry so much about ‘big/big’ and what not.

    Premier Icon binners
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    Surely a big ring is the purest possible indication of being gay?

    scottfitz
    Member

    scu98rkr- if you that concerned with weight ride a singlespeed and pedal your ass of to keep up with you mates πŸ˜€

    andyl
    Member

    One set of reasons for a triple:

    If you do a fair bit of road/cycle path to get to and from trails (ie don’t use your car to transport you to trails) then you can stomp along in the big ring and smallest 2 sprockets with a nice straight chain and not putting wear on your middle chainring you use out on the trails.

    One of the points of having 3 rings up front is straighter chain. You are not supposed to use the whole spread of the cassette with a single ring up front so using a triple correctly maximises drivetrain life due to less use of each chainring and less sideways articulation of the chain.

    But yes the negatives are reduces ground clearance, nasty cuts, a bit of weight and a lot of people don’t need the large ring.

    I actually went one worse that 22-32-44 on a 9 speed 11-32 cassette and went 10 speed 24-32-42 cranks. I get even more duplicate ratios and I lose the top most gears but I get a little bit better clearance than a large 44T, I never used 22-32 as it’s just too spinny and in return I get much better shifting up front, especially when mud takes hold so I am actually more likely to use the front shifting on a ride and not be scared to shift from the one I am in. Yes some people will claim their gear set up is amazing and they have no shifting problems but I’m not that good setting up gears and when caked in mud even the best set up gears struggle.

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