daveornee wrote:
> Robin Hubert Wrote:
>
>>I plan on building a set of XT M760/Sun CR18 36H, 3x. Wheelsmith
>>calculator gives 295/296mm for the rear, and spokecalc gives
>>294.9/396.5mm. My wheelbuilder uses the Wheelsmith calculator with DT
>>spokes and always adds 1mm to their calculation, which would result in
>>296/297mm. I plan on using DT 15/16 spokes. The spokes I have on
>>hand are 297/298mm. Opinions please.
>>
>>Thanks,
>>Robin Hubert
>
>
> I would caution you that Sun isn't the best in keeping ERDs the same
> within the same "model".
> When I run spocalc I get 297.6 mm front, 296.3 mm left rear, and 294.8
> mm right rear for you planned build.
> If you have the Wheelsmith rods or appropriate spokes/nipples, I would
> check the actual ERDs of the rims in question.
>
> I think that the spokes you have on hand will end up protruding from
> the back of the nipples when fully tensioned. Also remember that you
> will get more compression from the CR18 as it isn't quite as radially
> stiff rim when compared to Velocity Dyad (around the same weight, but
> stiffer due to it's profile)
> I would use 296 mm front, 295 left rear, and 293 right rear; but it all
> depends on the actual CR18s and the specific nipples you use.
> You could manually enter the data into the DT caculator once you have
> rim ERD. DT's calculator includes specific nipple and expected spoke
> stretch into their calculations.
The ERD for that rim is "612". I just built a set 3X with the XT M752
Rear hub in 36 hole, and an XT M753 Front hub in 32 hole. I used
Damon's spocalc.xls to figure the lengths and ended up with 295/296 in
the rear and 300 in the front laced 3X. When I run this with 760 hub,
34.2 Width from center to flange, and 38.0 diameter 36 hole, 3X I come
up with 297.7 for the front length, so 298's should work fine there. So
far I'm liking the wheels. Of course, the hard part was figuring out
which spoke hole to start with to get the valve stem, hub label, wheel
label in line...
--
Mark Wolfe Lakeside, ca
http://www.wolfenet.org
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