It's frothy man ! said:alright Jim cheers for that. Sorry for the questions come out machine gun style but i've only ever
ridden bikes, not constructed anything.
more " D hat - stand in the corner " type questions
i believe the Mavic rims are drilled w/ 20 holes.....does this effect the hub used.
Yes. I'm sorry I'm out of my depth on these particular rims (and wheels), but to be frank, it
looks like you are too. As Cosmics are normally supplied as part of complete factory-built wheels,
plus the fact that they're only 20h, I suspect *special* (thick!) spokes (probably Mavic) and
special techniques are required - and these will be relatively expensive and impractical.
Apologies in advance if I've got this all wrong, but you need to make SURE about all this yourself
before going ahead.
What about getting a more conventional pair of 32-spoke wheels built instead, using something like
Open Pro or CXP33 rims? With good spokes (like standard DT ss db, Sapim Laser or Sapim CX) and a
good hub, you could have truely lightweight, affordable and practical wheels which are surely good
enough for most amateur road racing. They may not be quite as aero as the fancy wheels, but only the
very fastest riders benefit much from that anyway.
There's usually no extra charge for building if you get everything from one dealer, or else you need
to use a spoke calculator (search via Google) for calculating the length based on ERD (effective rim
diamter), hub model, and lacing pattern.
But to persue the Cosmic option, try posting to rec.bicycles.tech to find out what spokes and hubs
would be suitable.
Quoted message said:I've checked out a few hubs on Wiggle, Shimano 105 hubs seem to have 32 or 36 holes as you mention
( i'm familiar with 105's ) . Obviously your gonna have some hub holes left out if the rims only
have 20 OR does it work where you must have a hub with 20 holes to equal the rim ?
Sometimes hubs with more holes can be used with complicated lacing, but I don't know in this case.
~PB