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27-04.-2006, 11:44 PM
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#1 |
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Registered User
Join Date: Nov 2005
Posts: 3
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cycle gearing
Hello,in the long distance past when I was raceing I think that in track -except motor paced (and roller) raceing the gear was restricted to 98" (number of teeth on chainwheel divided by the nuber of teeth on rear sprocket X dia. of rear wheel). I wonder what the restriction is today if any.
Aub |
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29-04.-2006, 06:58 AM
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#2 |
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Registered User
Join Date: Mar 2006
Posts: 151
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Re: cycle gearing
over here in oz the only gear restrictions are for the juniors. i dont know what they are coz im waaaay out of the junior ranks. 1 of the A grade trackies i know uses a 102 gear
 strong boy though |
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01-05.-2006, 08:25 PM
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#3 |
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Registered User
Join Date: Aug 2003
Location: Metung, Victoria, Australia
Posts: 57
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Re: cycle gearing
Gear restrictions only exist in junior racing and roller racing. There are no restrictions on anything else. Roller racing is limited to a roll out of 7.63m with a minimum crank length of 165mm. The 7.63m is roughly equal to a 95.6" gear when using tyres that are a true 27" in diameter. These days the tyre diameter ranges between 26.25" and 26.5" depending on profile. Therefore a 50/16 combination (96.43" gear) would achieve the correct gear with room to spare.
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01-05.-2006, 09:20 PM
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#4 | |
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Registered User
Join Date: Feb 2003
Posts: 696
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Re: cycle gearing
Quote:
A 50/16 is only 84.38".
__________________
VF "Remember, even if you win the rat race, you are still a rat" |
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01-05.-2006, 10:44 PM
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#5 |
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Registered User
Join Date: Aug 2003
Location: Metung, Victoria, Australia
Posts: 57
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Re: cycle gearing
Sorry about that, a mere typo, without checking after typing. Too cocky I guess. Goes hand in hand with the track sprinter mentallity.
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30-05.-2006, 03:19 PM
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#6 |
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Registered User
Join Date: Jun 2002
Location: Bathurst, NSW, Australia
Posts: 327
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Re: cycle gearing
I know that on a couple of smaller tracks with inadequate banking there has been gear restrictions set in the past. It used to be something silly like 88" (46x14) at the old muswellbrook velodrome in central NSW. But on a 180m concrete track what do you expect! No restrictions that i know of apart from the ones you mentioned (ie. juniors, rollers, derny etc.)
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