Trucs, astuces et autres pour vélo
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Autre methode
par Caillou » Ven Oct 06, 2006 9:36 am
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Caillou - Sportif de salon
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par Evil Sylvain » Ven Oct 06, 2006 11:17 am
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Evil Sylvain - Jedi de la pédale
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Re: Autre methode
par chtiman » Lun Jan 15, 2007 12:12 pm
Rocky Mountain Element 10 perso 2006
Lapierre Tecnic Lite single speed 2004
Lapierre Tecnic Lite single speed 2004
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chtiman - Ninja du wheelie
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par Deyv » Mer Mars 28, 2007 10:06 am
Des outils intéressant pour choisir un ratio pour les Singlespeed:
Et puis l'info la plus suprennante que j'ai trouvé:
Skid Patch
Fixed-gear riders who make a habit of doing "skip stops" you will wear the rear tire out considerably faster than those who use a brake. This problem is exacerbated by certain gear ratios, because they may tend to repeatedly skid on the same section of the tire.
Riders who plan to do a lot of skip stops should consider the ratio when selecting their chainring and rear sprocket. The mathematics of this is actually fairly simple:
* Simplify the gear ratio to the smallest equivalent whole number ratio.
* The denominator of the resulting fraction is the number of skid patches you will have on your rear tire.
Examples:
44/16 simplifies to 11/4, so there would be 4 skid patches.
45/15 simplifies to 3/1 so there would only be 1 skid patch.
42/15 simplifies to 14/5, so there would be 5 skid patches.
43/15 can't be further simplified, so there would be 15 skid patches.
This is based on the assumption that you always skid with the same foot forward.
If you are an ambidextrous skidder, and the calculation gives an even result, your number of skid patches will be the same.
If you are an ambidextrous skidder, and have an odd denominator, the number of possible skid patches will be doubled.
Et puis l'info la plus suprennante que j'ai trouvé:
Skid Patch
Fixed-gear riders who make a habit of doing "skip stops" you will wear the rear tire out considerably faster than those who use a brake. This problem is exacerbated by certain gear ratios, because they may tend to repeatedly skid on the same section of the tire.
Riders who plan to do a lot of skip stops should consider the ratio when selecting their chainring and rear sprocket. The mathematics of this is actually fairly simple:
* Simplify the gear ratio to the smallest equivalent whole number ratio.
* The denominator of the resulting fraction is the number of skid patches you will have on your rear tire.
Examples:
44/16 simplifies to 11/4, so there would be 4 skid patches.
45/15 simplifies to 3/1 so there would only be 1 skid patch.
42/15 simplifies to 14/5, so there would be 5 skid patches.
43/15 can't be further simplified, so there would be 15 skid patches.
This is based on the assumption that you always skid with the same foot forward.
If you are an ambidextrous skidder, and the calculation gives an even result, your number of skid patches will be the same.
If you are an ambidextrous skidder, and have an odd denominator, the number of possible skid patches will be doubled.
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Deyv - Gentleman Programmer
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