Gear inch/ratio question

Quite. Although there's a motorbike to look out for in the Keirin.

Why do you want to ride fixed with no brakes?

Wish I could make a list with all the (in)sane reasons, but I guess it boils down to me wanting to build a fixed with minimum of bits on it, and then of course at least try to use it. Bit like 'look, no hands, no hands'.. Not saying it's without risk or the most clever thing, but that's never been the way I've gone about doing things anyway.

Btw, (just reading through the posts), I didn't say I definitely didn't want to have brakes on the bike, just that I think I'll ditch them, meaning I want to get the gearing right for riding brakeless, but I might end up using a brake anyway. Or just go back to my good ol' roadie. What really floats my boat is to build the bike, as light and minimal as possible.

(don't want to hijack the thread, but I'm not allowed to post new yet)

...but I think I'll ditch the brakes all togehter on the fix. What would you guys pick for going around london brakeless on a daily basis?

option 1. see http://www.londonfgss.com/thread9446.html

option 2: have someone document your experience here

option 3: if this hasn't put you off, then ride 50 GI.

You can do what you want.. just don't expect me to be laying flowers at the scene of your demise and don't fscking crash into me or it will be the scene of your demise.

If you want to build a bike as light and minimal as possible then build a unicycle.

I know. keep the road bike. Spray it all white, including the tyres and lock. Lock it up somewhere on your normal commute route.

Rep biiatch

option 1. see http://www.londonfgss.com/thread9446.html

option 2: have someone document your experience here

option 3: if this hasn't put you off, then ride 50 GI.

I know. keep the road bike. Spray it all white, including the tyres and lock. Lock it up somewhere on your normal commute route.

Gotta love the sarcasm. So what you're trying to say is that I should use a brake and the search button. Point taken.

Cheers.

and who says we ain't educating the masses
repped hippy!

hehehe^

If anyone finds a stockist for Miche 18t cogs please let me know. I'm trying to gear down (47-18 from 47-17) for winter :(

46/17 for daily use.
46/16 on a discwheel for speedy hipsterness.. why flipflop when you can have two (edit: more) wheels? ;)

hipsterness only comes with sub 70 GI and doublestraps (I mean a friend told me).

I got my 18t

;)

hipsterness only comes with sub 70 GI and doublestraps (I mean a friend told me).

So what do you call a guy running a disc wheel (at 75GI's) ? :)

Cheers for the graph thing Julio. I take it that's based on a 700c wheel yah?

So what do you call a guy running a disc wheel (at 75GI's) ? :)

A time-trialer in training?

What relevance is the skid patch in this?

More skid patches = longer lasting tyre. Or you could just use brakes.

i think i know skid patches - does he have a mohican?

The Rule is:
If you have the ratio ie mine 44:16, and you divide it down to the smallest possible divisible fraction, then you have the potential numbe of skid patches.
SO 44:16 = 11/4, so 4 possible skid patches.
17 doesn't divide by anything. that is why it is good for your tires (17 skid patches possible).
I would change to 15, which would give me 15 patches, but i love the ratio as it is.

This isn't true. If you rode 34/17 or 51/17 you would have only one skid patch.
It's not to do with the primallity of the divisor, bout the co-primallity of the chainring and the sprocket.

no, but the fact remains that it still matters whether the top and the bottom can be reduced in terms of fractions.
i.e. 51/17=3/1
34/17=2/1
so actually it totally depends on the divisor, as all fractions do.

17 doesn't divide by anything. that is why it is good for your tires (17 skid patches possible).

So this is not true.

no 17 **Doesn't **divide by anything.
51 divides by 17

gear ratios are fractions, if you can work out fractions you're fine- in terms of skid patches.

in order to get gear inches:
multiply your ratio by 26.4 for 700x23c
or by 27.1 for 27x1/1/4"

I think we can agree that 17 is prime. The fact that 17 is prime will not (as stated by you) will not guarantee 17 skid patches.
19 and 23 are better prime nos. anyway. (insert smiley face here)

I agree smiley faces all round,
but I never guaranteed 17 skid patches, unless you had a 44T up front