help calculating spoke lengths - sturmey archer hub + 700c rim
al77
to build a wheel? I have a sturmey archer xrd-3 hub and a rigida zac
2000 36 hole 700c rim. I've looked at some of the online calulators
and have got my self suitably confused! I have the following specs on
the hub:
XRD3 / 3 Speed Internal Gear Hub with 70mm Drum Brake
Specs
• Axle Length - 162.7mm
• Over Locknut Dimension - 117.3mm
• Right Axle Protrusion Length - 23.1mm
• Left Axle Protrusion Length - 22.3mm
• Spoke Holes - 36
• Pitch Circle Diameter - 89.8mm
• Flange Width - 62.6mm
• Spoke Compatibility - 13g or 14g
• Sprocket Teeth - 13T through 22T
• Chain Line: 1/8” Flat 13T ? 19T - 44.9 43.2
• Chain Line: 1/8” Dished 17T ? 22T - 46.6 45.0 43.2 41.6
• Chain Line: 3/32” Flat 16T - 44.5 42.9 45.1 43.5
• Chain Line: 3/32” Dished 17T ? 22T - 46.9 45.3 42.7 41.0
& for the rim:
> Size : 622x19 (700C)
> Sides : UP
> Eyelets : SE DE
> Spokeholes : 32-36
> Valve hole : 6.5 -8.5 mm
> Alloy : 6063 T6
> Tyres : 28-62mm
+ pics of rim including some measurements here -
http://www.rigida.com/en/products/hybride-city/rims-5/zac-2000-4
any help would be appreciated! thanks, Alan
landotter
>
> any help would be appreciated! thanks, Alan
285mm assuming a 599mm erd. Someone double check it.
Norman
I get (assuming that PCD means flange diameter) 268.5 for 3x
& 278.5 4x for an ERD of 595.4 (estimated from the 21.4mm
drop from the bead as compared with other rims). Meow?
datakoll
see the other on page wheel=spoke post and buy a tape measure or
yardstick. Wal carries some metal rulers over is SEW
landotter
I get the same numbers with that ERD. Got mine from a Ben's Cycle
page, FWIW.
Norman
Belay that, I still had it on 48 holes. 278.5 for 3x, 294 4x.
599 ERD gives me 280 & 295.5 for 3x & 4x respectively.
I advise getting a ruler and making actual measurements.