Re: Chain idler efficiency - roller vs. toothed

jobst.brandt@[EMAIL PROTECTED]
 aka Jobst Brandt wrote:
> The angle at which the chain enters and leaves front sprockets and
> derailleur idlers is the sine of the angle which is the lateral offset
> between the two ends of the chain span divided by the free span
> length.  Therefore, the longer the chainstays and the fewer the gears
> on the sprocket cluster, the smaller the angle between chain and
> sprocket plane.  The angle causes lateral sprocket tooth wear and
> idler wheel wear.
> 
Indeed, which is why I would not deliberately ride in cross chain gears 
on my ATB with its 43 cm chain line (BB to hub) but will do so on my 
RANS Rocket with its 131 cm chain line.

-- 
Tom Sherman - Holstein-Friesland Bovinia
The weather is here, wish you were beautiful