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PostPosted: Sat Mar 09, 2013 9:32 pm 
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Can someone give me the spoke length required for a front wheel 3 cross build using a 32 hole XTR m900 hub and Mavic m231 rim?

Thanks!


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PostPosted: Sat Mar 09, 2013 10:06 pm 
retrobike rider
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268 probably, but await conformation from others.

One minute...

viewtopic.php?f=1&t=130492&p=969399&hilit=spoke+length+book#p969399
and http://lenni.info/edd/
M900 hubs are close enough to all the other shimano hubs of the same style to not worry about.


Last edited by FluffyChicken on Tue Mar 12, 2013 8:54 am, edited 1 time in total.

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PostPosted: Sun Mar 10, 2013 10:27 am 
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http://www.sapim.be/spoke-calculator


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PostPosted: Mon Mar 11, 2013 3:27 pm 
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Do I have to have the exact spoke length or is there a bit of leeway, say plus/minus 2 or 3 mm?


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PostPosted: Mon Mar 11, 2013 3:51 pm 
retrobike rider
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Firstly, Roger Musson advises rounding down, rather than up. My feeling is that spokes 1mm too short is quite ok, 2mm too short is kind of outer limit and 3mm too short is going to be too weak (i.e., not enough threads will correspond). Spokes too long is similar in terms of strength, but a pain in terms of driving with a screwdriver.

Someone will probably come on and say 'I never bother and some of my spokes are 5mm too short and I've never stripped a thread yet', in which case good luck, but I doubt whether the spoke makers would go the expense of making spokes in 1mm increments if any old length would do.

I think you can compensate for shorter spokes if you use longer nipples with more thread, but I'll have to leave it to somebody else to explain that, as I've never done it.


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PostPosted: Mon Mar 11, 2013 8:34 pm 
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It's important the thread of the spoke passes all the way through the nipple. i.e. if the calculator says 251, then I'd buy 252 to be sure.


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PostPosted: Mon Mar 11, 2013 10:49 pm 
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cool calculator!!!!


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PostPosted: Tue Mar 12, 2013 11:17 am 
retrobike rider
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gtRTSdh wrote:
It's important the thread of the spoke passes all the way through the nipple. i.e. if the calculator says 251, then I'd buy 252 to be sure.

We'd better tell Roger Musson that gtRTSdh knows more about wheel building than he does. Stand well back everybody.


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PostPosted: Tue Mar 12, 2013 12:41 pm 
retrobike rider / Gold Trader
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Spocalc tips out 268.5

if you can get 269's i'd run those, but 268s if not. I generally round in the "closest" direction, though I've rounded xxx.8 and xxx.9 up to xxx+2 before now.


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PostPosted: Tue Mar 12, 2013 2:52 pm 
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268, rounding up to 270 rather than down to 266 if you know what I mean

My fave spoke calculator

http://lenni.info/edd/


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