#1
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Spoke Length
Used the Damon Rinard spoke calc program to calculate spoke length for
some wheels I'm building. 32 hole. 3 cross front and rear. Record hubs. Alex Crostini 3.1 front and 3.2 offset spoke hole rear. DT Revolution 14/17 spokes front and non drive side. DT Competition 14/15 drive side. Spoke calc says 294mm for front. I'm comfortable rounding that down to 292mm. Spoke calc says 292.8mm non drive side and 291.2mm drive side. I'm thinking round down to 290mm for both sides. Could be maybe persuaded to use 292mm on the non drive side. Any opinions on the above choices? |
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#2
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Spoke Length
On Jan 25, 9:30*pm, "
wrote: Used the Damon Rinard spoke calc program to calculate spoke length for some wheels I'm building. *32 hole. *3 cross front and rear. *Record hubs. *Alex Crostini 3.1 front and 3.2 offset spoke hole rear. DT Revolution 14/17 spokes front and non drive side. *DT Competition 14/15 drive side. Spoke calc says 294mm for front. *I'm comfortable rounding that down to 292mm. Spoke calc says 292.8mm non drive side and 291.2mm drive side. *I'm thinking round down to 290mm for both sides. *Could be maybe persuaded to use 292mm on the non drive side. Any opinions on the above choices? Why are you rounding down so far? Why not 294 and 291/293? Has your experience been that the spoke calc yields long spokes and that some length reduction is required? Damon's spoke calc has been good for me. I usually just get the closest whole number unless I'm just getting by with old spokes or doing a "close enough" rim swap. -- Jay Beattie. |
#3
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Spoke Length
YO RUSS !
BUILD A WHEEL BEAM. take a tubah4, bore hole for your hub ( or use a long threaded rod for an axle) , shim up diameter for dish with ply or 3/4. buy 16 spokes, 8 each side, insert at quarters. then you know what's going on there. oytherwise. its PITW time. build the beam. its an essential tool. |
#4
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Spoke Length
On 26 Jan, 05:30, "
wrote: Used the Damon Rinard spoke calc program to calculate spoke length for some wheels I'm building. *32 hole. *3 cross front and rear. *Record hubs. *Alex Crostini 3.1 front and 3.2 offset spoke hole rear. DT Revolution 14/17 spokes front and non drive side. *DT Competition 14/15 drive side. Spoke calc says 294mm for front. *I'm comfortable rounding that down to 292mm. Spoke calc says 292.8mm non drive side and 291.2mm drive side. *I'm thinking round down to 290mm for both sides. *Could be maybe persuaded to use 292mm on the non drive side. Any opinions on the above choices? interlacing lengthens the route of a spoke by spoke thickness and tensioning stretches it. Tensioning may be as little as three turns, but some like double that. |
#5
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Spoke Length
are you aware of the ERD problem ?
the spoke calc when last visited and growled over produced a 'geometric' X nuber not the useable "order 36 of these at Xmm" number. Then useable number is X-Y where Y deducts 2-3-4mm getting the spoke short enough to actually seat on the rim inwhatever nmber of spokes the rim takes in producing around wheel with hub in center and dished properly. ? |
#6
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Spoke Length
On 27 Jan, 01:09, datakoll wrote:
are you aware of the ERD problem ? the spoke calc when last visited and growled over produced a 'geometric' X nuber not the useable "order 36 of these at Xmm" number. Then useable number is X-Y where Y deducts 2-3-4mm getting the spoke short enough to actually seat on the rim inwhatever nmber of spokes the rim takes in producing around *wheel with hub in center and dished properly. ? I assume that no account is taken for oversize hub flange holes and the bedding in that a spoke must do on an aluminium flange. That'll make up for the extra length required due to interlacing, at least. Of course there are desirous reasons to use fibre washers under the nipple heads including correction of spoke 'length'. |
#7
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Spoke Length
On Jan 25, 10:30*pm, "
wrote: Used the Damon Rinard spoke calc program to calculate spoke length for some wheels I'm building. *32 hole. *3 cross front and rear. *Record hubs. *Alex Crostini 3.1 front and 3.2 offset spoke hole rear. DT Revolution 14/17 spokes front and non drive side. *DT Competition 14/15 drive side. Spoke calc says 294mm for front. *I'm comfortable rounding that down to 292mm. Spoke calc says 292.8mm non drive side and 291.2mm drive side. *I'm thinking round down to 290mm for both sides. *Could be maybe persuaded to use 292mm on the non drive side. Any opinions on the above choices? Use 294 or maybe 293 for the front since these are thin and use 292 and 291 for the rear. Why take off so much? You will end up with threads showing. |
#8
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Spoke Length
On Jan 25, 9:30*pm, "
Any opinions on the above choices? I'd use thicker spokes than Revolutions, to make building and truing less of an exercise in contending with spoke windup. Tom Ace |
#9
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Spoke Length
On 27 Jan, 15:12, Tom Ace wrote:
On Jan 25, 9:30*pm, " Any opinions on the above choices? I'd use thicker spokes than Revolutions, to make building and truing less of an exercise in contending with spoke windup. Tom Ace 'windup' is not an issue at respectable spoke tension. Relieving the spoke tension by moving the rim by hand or a timber lever is simple and easy. |
#10
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Spoke Length
Tom Ace wrote:
On Jan 25, 9:30 pm, " Any opinions on the above choices? I'd use thicker spokes than Revolutions, to make building and truing less of an exercise in contending with spoke windup. Tom Ace I learned a good trick on this group for dealing with windup in the rear: Tighten the drive side spokes to about where they need to be (trial and error) while leaving the nondrive side relatively slack (so the wheel is greatly "overdished"). Bring the nondrive side up to tension last, correcting the overdish. The idea is that you never deal (much) with the drive side spokes at full tension. The non-drive side is always at lower tension anyway. Finally, Sharpie ("permanent" marker) marks on spokes help you see windup, which goes a long way toward dealing with it. Despite the "permanent" description, they wipe off easily with something like WD-40. PS - as others have said, why round down your lengths so much? Mark J. |
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