Tony W said:"Andy Koppe" <a n d y @ d c s . e d . a c . u k> wrote in message
Quoted message said:Quoted message said:Did you try slicker tyres and higher pressure? Knobbly tyres and low pressure are the main reasons
why MTBs feel sluggish on the road.
Quoted message said:Significant reasons, yes -- main reasons, questionable.
MTB gearing is, typically, significantly lower, tyres significantly wider and the riding position
significantly more upright -- and less 'efficient' than a road bike.
I'd go with "main": the Brompton runs 100 psi Marathons and despite being sit up and beg so quite
comedic on the aerodynamic front and gears that are in no way designed for speed (3 speed SRAM hub
with 18% reduction from Brompton's standard), I can *easily* maintain higher speeds on road than I
can manage on the MTB with 2.1" knobblies. The MTB gearing does go a lot lower, but on the big ring
it's still a whole lot harder to spin out than the Brom. The knobblies make it great fun in mud and
capable over rocks, but really do suck the life out of the thing on the road. The only time I ever
ride it on the road is getting to some off-road!
Also the case that one of the easiest ways to change to slicker tyres is get a second set of wheels,
rather than physically move the tyres over each time. And if you're slotting in a different wheel,
might as well have some smaller cogs and jumps between them on the road wheel. That will make it
vastly better on the road, and I'd be surprised if the OP's MTB won't take a rack if he wants to
move stuff. Damn site cheaper than a new bike too, though it won't do road racing. But there again,
he can spend the new bike money on a racer if he later decides it's the route for him, rather than
straight away.
Pete.
--
Peter Clinch University of Dundee Tel 44 1382 660111 ext. 33637 Medical Physics, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK net [email hidden]
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