What gear setup does Mark Cavendish use to hit 40mph on a flat?
07-28-10 | 12:49 PM
#26
Senior Member
Joined: Apr 2007
Posts: 2,076
Likes: 1
From: Tulsa OK
Ah, but that wouldn't change the ratio.
The gear ratios on a chain (or any gear for that matter) aren't actually a function of the teeth but rather of the diameter of the gear. Because the teeth are on a fixed pitch changing the number of teeth and keeping the spacing equal has the effect of changing the diameter, but it's the diameter that matters from a mechanical advantage point of view.
If you take an existing gear and break off teeth, the diameter remains the same and therefore so does the gear ratio.
The diameter of the axle and the axle support bearing is the limiting factor on how small the rear cog can get. At current chain pitch, that corresponds to 11 teeth.
DG
The gear ratios on a chain (or any gear for that matter) aren't actually a function of the teeth but rather of the diameter of the gear. Because the teeth are on a fixed pitch changing the number of teeth and keeping the spacing equal has the effect of changing the diameter, but it's the diameter that matters from a mechanical advantage point of view.
If you take an existing gear and break off teeth, the diameter remains the same and therefore so does the gear ratio.
The diameter of the axle and the axle support bearing is the limiting factor on how small the rear cog can get. At current chain pitch, that corresponds to 11 teeth.
DG
07-28-10 | 01:30 PM
#27
Senior Member
Joined: Dec 2009
Posts: 619
Likes: 35
From: The Cotswolds, England
Bikes: Giant Revolt 2. Velo Orange Pass Hunter flat bar
Nothing to do with ratios and aerodynamics... the guy is just superhuman.
What makes them all go fast though, is tubulars, inflated to 200psi... try it... after 120 miles you'd go pretty fast just to get off the bike and rest your ass!
What makes them all go fast though, is tubulars, inflated to 200psi... try it... after 120 miles you'd go pretty fast just to get off the bike and rest your ass!
07-28-10 | 03:12 PM
#30
Senior Member
Joined: Jan 2005
Posts: 3,708
Likes: 73
From: 5200' Boulder, CO Area
Bikes: Specialized 6Fattie, Parlee Z5, Cannondale SuperX
Ah, but that wouldn't change the ratio.
The gear ratios on a chain (or any gear for that matter) aren't actually a function of the teeth but rather of the diameter of the gear. Because the teeth are on a fixed pitch changing the number of teeth and keeping the spacing equal has the effect of changing the diameter, but it's the diameter that matters from a mechanical advantage point of view.
If you take an existing gear and break off teeth, the diameter remains the same and therefore so does the gear ratio.
The diameter of the axle and the axle support bearing is the limiting factor on how small the rear cog can get. At current chain pitch, that corresponds to 11 teeth.
DG
The gear ratios on a chain (or any gear for that matter) aren't actually a function of the teeth but rather of the diameter of the gear. Because the teeth are on a fixed pitch changing the number of teeth and keeping the spacing equal has the effect of changing the diameter, but it's the diameter that matters from a mechanical advantage point of view.
If you take an existing gear and break off teeth, the diameter remains the same and therefore so does the gear ratio.
The diameter of the axle and the axle support bearing is the limiting factor on how small the rear cog can get. At current chain pitch, that corresponds to 11 teeth.
DG
I was looking for an emoticon with a couple of missing teeth, but no such luck. A smile with a few missing teeth is still a smile.
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