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how many of you guys know what gear development is?(12 posts)

how many of you guys know what gear development is?dustin73
May 18, 2002 10:09 PM
and those who do, do you use it?
Paul Sherwin...Wayne
May 19, 2002 4:35 AM
is the only person I've ever heard use this term. Based on context, I think it just means the same as gearing or gears, such as 39x21 or 53x12. His use is something like, "today's climb with be vicious, they will be using a very low gear development, some riders have even put a 25 on the rear!"
It's an English (or Continental) termKerry
May 19, 2002 5:36 AM
They state development as "distance traveled per revolution of the pedals." So it is gear inches times Pi (3.14) - units are still inches, or length. A 73 inch gear (53/19, or 39/14) is 230 inches development, or 5.8 meters. The meaning is exactly the same as our "gear inches." Gear inches came from a calculation to get the equivilent diameter of a high wheeler front (driving) wheel.
re: how many of you guys know what gear development is?MP
May 19, 2002 9:32 AM
It is the same as gear-inches. The Campy Ergobrain computer uses the term Gear Development rather than G.I.
geeze...i was expecting more responses...dustin73
May 19, 2002 3:22 PM
anyway, i was rather annoyed to see what my 105 cassette was, but this is my GI chart:

Gears: 39/53 12-13-14-15-17-19-21-23-25

CRxFW GI
1> 39x25-- 41.81
2> 39x23-- 45.44
3> 39x21-- 49.77
4> 39x19-- 55.01
5> 53x25-- 56.82
6> 39x17-- 61.48
7> 53x23-- 61.76
8> 53x21-- 67.64
9> 39x15-- 69.68
10> 39x14-- 74.66
11> 53x19-- 74.76
12> 39x13-- 80.40
13> 53x17-- 83.55
14> 39x12-- 87.10
15> 53x15-- 94.69
16> 53x14-- 101.46
17> 53x13-- 109.26
18> 53x12-- 118.37
Uh, why?Kerry
May 19, 2002 3:51 PM
You just asked what gear development was. You didn't ask what everyone else's gear development was. And then you post your gear inch chart, which is NOT development, it's inches. What is the meaning of all this? Are you trying to find out what gears others are using? If so, how about you ask that question, instead of the one you did ask?
if you would've read my follow-up question...dustin73
May 19, 2002 4:28 PM
which you obviously did not, i asked if anyone uses it, whether for training, SS, or whatever. i find it quite interesting, and i doubt very many novice cyclists know about it.

and if i wanted to find out gears, don't you think i would've asked, champ?

are you always a smart-ass?
Sorry, what follow up question? Don't see it. (nm)Sintesi at home
May 19, 2002 5:10 PM
ummm...SteveO
May 20, 2002 7:51 AM
in response to your follow-up 'question', anyone who pedals a chain-driven bike 'uses' development.
need a 16gtx
May 19, 2002 8:26 PM
do you ever use the 12? If not, I'd go with the 13-25.

http://www.lickbike.com/i2293050.htm
actually...dustin73
May 19, 2002 9:09 PM
i use the 12 more than the 25. i wouldn't mind giving the 12/23 or 12/21 a try, though.
re: how many of you guys know what gear development is?DougSloan
May 20, 2002 7:42 AM
Everyone I know talks in terms of "gear inches." I think most people simply use front/rear x 27 inches, which is not really accurate, but common for comparison.

Development is more of a technical term. I think it's the same as "roll out"; a useful term if you are comparing bikes with different wheel sizes.

Doug