Gear Ratios

[mr ailsbury]

right, i'm running a 16 tooth front freewheel and a 12 tooth fixed cog on my 06 python but it doesn't work...

put a link in its too loose/take a link out its too tight situation

so I was thinking of getting an 18 tooth front freewheel and a 13 tooth surly screw on cog for the back but I want it to feel the same as 16:12.

so would 18:13 feel the same as 16:12 or would i need 18:14

AND would this work on my python with a KMC kool chain or a KHE collapsable chain because I need to be 100% sure before i go spending all my money.

cheers

Edited May 13, 2006 by mr ailsbury

[King C]

Its not as easy as just adding a tooth or taking one away. You have to divide the front by the back which gives your ratio eg 16:12 = 1:1.333 (3dp).

18:13 would give you 1:1.385(3dp)

18:14 would give you 1:1.286(3dp)

I've had the same problem, just run 18:12 and it'll work fine but won't feel the same as 16:12

Edited May 13, 2006 by kcchan

[onzatprodude]

well if its the same as maths the lowest ratio 16:12 is 4:3 so to run an 18th freewheel it would equal 18:13.5 so its in the middle so i dont think it would matter as theres an equal difference between the two chain rings (14 and 13)...but someone correct me if this is all wrong

Edited May 13, 2006 by onzatprodude

[mr ailsbury]

ok so 18:13 would feel ok but would it work on my bike?

[munkee]

no it wouldnt, you'd be in the same situation as before. Too tight too slack situation = half link.

Edited May 14, 2006 by Spacemunkee