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Wheel building - spoke size(6 posts)

Wheel building - spoke sizeibhim
Oct 27, 2002 5:23 PM
There are many good calculators that calculate spoke size based on rim and hub. Unforunately, NONE address how to interpret the decimal in the final calculation. Do you round up, round down or simply ignore the decimal and use the whole number?

Consider Shimano Dura Ace with Mavic Open Pro

Front = 296.7
Rear = 295.7 and 294.1

What size spokes should be purchased?
re: Wheel building - spoke sizegtx
Oct 27, 2002 7:39 PM
use 297s for the front and 296 and 294 for the rear.
Agree.Spoke Wrench
Oct 28, 2002 5:40 AM
I'd round to the nearest. As long as you are within 1mm of optimum, you aren't going to have any problems.

I like the spoke calculators that have a data base of hubs and rims. The biggest problem I've had has been measuring hubs and especially rims as accurately as is necessary to do a decent spoke calculation.
try thiscurlybike
Oct 28, 2002 6:03 AM
Wheelsmith makes rods for measuring the seat to seat distance or you can make measuring tools yourself using spokes of a known length with nipples threaded on to the nipple with the spoke just at the bottom of the slot and crimped. Install the spokes in your unknown rim in diametrically opposed holes. Measure the gap between the spoke ends and add to the combined length of the two spokes. This is your rim erd.
Thanks and additional linkibhim
Oct 28, 2002 3:10 PM
Thanks for your assistance

The best calculator I found (and the only one with a database of hubs and rims) is spocalc.xls. You can download it from...

Also, has good articles on wheelbuilding.

Thanks again.
DT Spoke CaculatorKen
Oct 28, 2002 5:12 PM