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

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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.

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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?