Joined: Feb 2006
Posts: 12,286
Likes: 317
From: Lake Geneva, WI
Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2
Originally Posted by
PlatyPius
Really?
a) 110mm bolt circle has a minimum chainring size of 34 teeth.
b) Who in the hell needs something THAT wimpy?
c) Hills go downhill, too....
d) If you need a 30 tooth ring on a road bike - and you don't live in the Alps or Andes - you're doing something wrong.
e) Buy a triple crank, take the big ring off, and you have a 40/30 or 42/32 crank.
I don't need a 30t for where I live. I now use a 44t single with Salsa Crossingguards and a 12-27 cassette.
My gearing looks like this;
Gear chart using MPH @ 100 RPM
For 700 X 28 / 28-622 tire with 175 mm cranks
With 10-speed 12-13-14-15-16-17-19-21-24-27 Cassette
44t
12 29.2mph
8.3 %
13 26.9mph
7.7 %
14 25.0mph
7.1 %
15 23.4mph
6.7 %
16 21.9mph
6.3 %
17 20.6mph
11.8 %
19 18.4mph
10.5 %
21 16.7mph
14.3 %
24 14.6mph
12.5 %
27 13.0mph
But... If I ever want to tour or take a century ride in Colorado or Vermont, I'm SOL even with a 50t & 34t unless I want to wreck my knees.
Michael
__________________
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
Last edited by Barrettscv; 08-09-09 at 07:45 AM.