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From: bp@www.zefox.net
Newsgroups: rec.bicycles.tech
Subject: Re: Suspension losses
Date: Fri, 3 Jan 2025 02:26:32 -0000 (UTC)
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AMuzi <am@yellowjersey.org> wrote:
> 
> Yes, I'm familiar with surface finish (roughness) numbers in 
> machining, but an offroad bicycle, for example on a gravel 
> path (bianca strada) or babyheads (much of Paris Roubaix) 
> would be a series of variable impedimenta in some chaotic 
> non-order for height & frequency.  The principle is the same 
> but the amount of data is staggering.
> 

But, what matters is the sum of impediments over the path, regardless
of where in the path they turn up. So long as the potholes aren't
missed it doesn't matter exactly where they are. For something
regular, like Belgian block pavement, impediments line up and certain
paths might find or miss more or less of them, but over the course of
the path _most_ paths have essentially the same sum of deflections.  

Gravel is a special case, because some of the losses occur in the
road surface. For that problem a tire that minimizes deflection of
the road is best. 

Thanks for writing,

bob prohaska