What's your favourite gear ratio?

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  • Is there a formula for working gear ratios ?

    Can you do division (calculators are allowed in this exam)? Then you're good to go.


  • Or this if you don't want to think, and you want gear inches rather than ratios which you asked for.

  • All is I know is that I have a 17 on and it's gets me all but the steepest of stuff. Is there a formula for working gear ratios ?

    Front teeth / Back teeth gives you the ratio.
    I'd guess you'll be on something between 40/17 giving you about 2.4 turns of the rear wheel for one turn of the pedals and 48/17 giving you 2.8.
    There are plenty of websites with the various gearing measures programmed in for calculation. See http://www.bikecalc.com/gear_ratios

  • Good good keanulooser

  • 48/17!

    How many times people?!

    Ratio of the Gods.

  • If Prime/Co-prime gearing does help with wear (https://news.ycombinator.com/item?id=240­6562) how come 47T or 49T chainrings seem much more rare than 48T?

  • How many times people?!

    Ratio of the (flat) Gods.

    ftfy.

  • I MAKE AGREEMENT.
    (London Cambridge London is flat.)

    How many times people?!

    Ratio of the Gods.

    ftfy.

  • New sprocket so went down a tooth to a 52/18. A minor tweak but it feels quite significantly better to me.

  • What ratio would you guys recommend for a slightly flabby, unfit 46yr old. Converting a Raleigh Scorpio on a really tight budget to SS, so using the existing inside ring of 42 what would you recommend for the back?? Would 16 be ok?!

  • perfect x

  • Cheers noisier :)

  • Running a 46/15 and in East Mids. Looking at 48/17 and 48/15 though as I now have a fixed/fixed hub..

  • perfect x

    Aye. 42x16 is the out of the box ratio for lots of off the peg fixed bikes. You'll run it for a while, think you need bigger, then realise it's actually the perfect compromise for stop/start town riding and the odd undulating country ride.

  • It's pretty flat where I intend riding apart from the hill back up to my house so sounds good

  • Running a 46/15 and in East Mids. Looking at 48/17 and 48/15 though as I now have a fixed/fixed hub..

    For riding on the street 48/19-17 is probably more useful.

  • I started riding the street using 48/17 (pretty flat), but quickly progressed to 48/16, then 48/15. Am now using 48/14, which is probably where I stop, but it's cost me £20 a cog for every change.

  • And to think that's £60 in the wrong direction...

  • n/a

  • 48x14 is about 25mph at a 90 odd cadence, over 30mph at a 120 spin.

    Do people really push that as an everyday gear? I struggle to average 20mph round town or on a decent length ride. #weak

  • This is my everyday gear; I have a 15T on the other side, but I'm on the track every week and I'm basically lazy.

  • n/a

  • Been riding 49/17 but can barely hit 30 for a few secs, am wondering whether i should drop to 48/17 slightly lower ratio but same patch wise which doesnt really matter to me as I cant skid?

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What's your favourite gear ratio?

Posted by Avatar for smurfbike @smurfbike

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