Originally Posted by
ulateman
Are different Campy hubs of the same period (specifically Record 10s, Chorus 10s, Mirage 9/10s in this case) all the same sizes, especially as far as spoke length is concerned? Thinking about swapping out hubs between my OP/Campy 9/10s hub wheels. Novice at wheel building, can I re-use the spokes on the rim, say Chorus 10s hub to re-lace to Mirage 9/10s hub?
If you re-use the spokes you want them to end up in the same positions (front wheels have leading and trailing; and on rear wheels you also have different spokes on the two sides so there are four groups) because they've been bent to match the flanges.
Btw, also, what is best way to measure rim
Take two spokes of known length. Insert them in opposite holes on the rim. Thread the nipples you'll be using on to the depth you want. Measure across the elbows (I like dial calipers) and add to the total spoke length. Repeat in a few places because the rim might be ovoid and average. For example, you have a pair of spokes which measure 278mm, get .925 and .920" across the elbows, and end up with an ERD of 2*278 + 23.45mm = 579.5.
Account for stretch when ordering spokes.
hub to figure out spoke length?
Calipers. Harbor Freight has digital calipers for under $20.
Or just look at the manufacturer's specifications. Hub measurements are standardized and you don't get the variations you do with rims where ERD measurements aren't standard (with spokes extending to the nipple slots? or spokes extending to the nipple ends) and things vary (the last three rims I've measured with a claimed ERD of 577 or 579 depending on who you talked to were round at 578mm, round at 579.5mm, and ovoid at 578x579.5)