London Fixed-gear and Single-speed SJS Cycles

Balki · 17th May 2009

- Yes
- No

Do you have a brake?

Balki · 17th May 2009

Also, my calculator makes that a difference of 1.1 GI.

okwithmydecay · 17th May 2009

I have brakes and am no hurry to take them off, but would like to learn to brake just using the pedals.

With 172.5 crank arm length and 700x28c tyres, the Rabbit calculator gave me 70.2GI for 42/16 and 71.4 for 48/18, so right you are a difference of 1.1GI or so.

Sounds like 42/16 is the better bet given I already have a 42T chain ring and it's slightly easier on the pedaling.

samwillard · 26th June 2009

hi

Trying to decide what ratio to go for Ive got a 46 chainset on the front and was thinking 16t (single speed not fixed)

I live in wimbledon so fairly hilly so looking for something fairly good for that – any ideas?

Cheers

sam

Zippie · 26th June 2009

Yes, sounds perfect, you should be able to get up almost anything with that, spin up to 25mph on the flat for short distances, and go down hill at any speed.

Potetskrel · 4th July 2009

I think I've found that 48.18 is Much to spinny for cornwall But should i drop another tooth or two? i cant decide
If i go down to 17 that means il have 17 skid patches by my calculator which is better than 3 :)

maxcrowe · 5th July 2009

go down to 17 then

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17th May 2009	#101
Balki	- Yes - No Do you have a brake?
	quote reply

17th May 2009	#102
Balki	Also, my calculator makes that a difference of 1.1 GI.
	quote reply

17th May 2009	#103
okwithmydecay	I have brakes and am no hurry to take them off, but would like to learn to brake just using the pedals. With 172.5 crank arm length and 700x28c tyres, the Rabbit calculator gave me 70.2GI for 42/16 and 71.4 for 48/18, so right you are a difference of 1.1GI or so. Sounds like 42/16 is the better bet given I already have a 42T chain ring and it's slightly easier on the pedaling.
	quote reply

26th June 2009	#104
samwillard	hi Trying to decide what ratio to go for Ive got a 46 chainset on the front and was thinking 16t (single speed not fixed) I live in wimbledon so fairly hilly so looking for something fairly good for that – any ideas? Cheers sam
	quote reply

26th June 2009	#105
Zippie	Yes, sounds perfect, you should be able to get up almost anything with that, spin up to 25mph on the flat for short distances, and go down hill at any speed.
	quote reply

4th July 2009	#106
Potetskrel	I think I've found that 48.18 is Much to spinny for cornwall But should i drop another tooth or two? i cant decide If i go down to 17 that means il have 17 skid patches by my calculator which is better than 3 :)
	quote reply

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