Wheelbuilding / Wheel Building / Wheel build help

That was for the rear. You said disc hubs are offset. The front is an SP dyno hub and it isn't.

I'm just joking with you anyway.

Not!

banned

;)

So, if anyone wants to buy a 135mm XT rear hub or an offset 32h Kinlin rim, let me know...

ah ok

99% of front disc hubs are offset. Sorry...

No probs. I've got a spare offset for now. Hopefully cycle clinic gets back to me about the non-offset one so I can set TBW to building..

Yet (unless i'm being very dense and reading them backwards) the Shimano instructions specify spoke patterns what will see the woven crossing points move outwards under disc-braking forces for all except the drive-side rear.

I've heard it said that having outbound spokes take the braking forces gives the wheel a little more lateral strength under braking due to their slightly better bracing angle. Maybe Shimano are so confident that they've designed their hubs and calipers to avoid crashing the spokes into the calipers that the marginal bracing effect is worth going for. Whether that's still true when you bring other manufacturer's components into the mix is less clear.

Tom! We haven't heard from you for a while.

Nothing like a knotty technical problem to bring you out of hiding. :)

Maybe Shimano are so confident that they've designed their hubs and calipers to avoid crashing the spokes into the calipers that the marginal bracing effect is worth going for.

If they wanted to improve the bracing angle, they would adopt the Boost110 "standard", 5mm more flange offset on the disc side is actually worth having.

Are there cheaper/better value alternatives to CX Ray spokes?
Can Hope Mono hubs be slotted for bladed spokes without problems? and are they OK for a 18 spoke radial front build?

There's the Pillar PSR 1442, but it's not that much cheaper than CX-Rays in small quantities - no doubt the difference is much more if you're buying in OEM quantities. Neither a CX-Ray nor the PSR 1442 will require the hub to be slotted.

I'd like to have a go at building a set of 406mm wheels for a Moulton. Its something I've never done (building wheels in general), so, it'll be a bit of an experience and a learning curve.

I've done some reading and got a set of hubs from eBay last Sunday for £50. A pair of new American Classic's, which apparently aren't the worst hub, and aren't the heaviest either.

And then some further searching led me to some rims:

KINLIN NB-R 406 MM 245 GR for 39EUR each and they're quite light. As far as I can tell, Kinlin aren't the worst rim manufacturer either.

Next up, I need to get spokes, and nipples. Currently, I was looking at the Sapim Laser, silver, J-bend spokes, as I think they're on Moulton's own 406mm wheels, and with 32 spokes they should be strong enough? And nipples. Would the Sapim Polyax 12mm aluminium nipples ones be okay? All reading suggests get the shortest you can.

Does anybody know if the above combination will kill me? From all the reading I've done, the 406mm rims appear pretty strong, and with 32 spokes that should be relatively okay for somebody to try for the first time?

Any advice?

32 holes will be more than strong enough for a small rim like that, and as you're a first timer, stay away from alu nipples.

Shimano dh-3d72 and dh-s501 hubs are offset. Get one of these to use the kinlin rims

as they're shit, stay away from alu nipples.

ftfy

yeah but i'm a politer

and as you're a first timer, stay away from alu nipples.

Brass? 12mm?

Brass and 12mm should be fine.

Can someone advise me where I can pick up a bunch of black sapim brass nipples today in london? Failing that, any other brand of nipple that is black. Thanks

Condor? Bike fix? SBC? You'd really need to call them.

No luck with any of those :(

Evans stock black sapim spokes

Which one? I called the cut and london bridge and they both said they would need to order them in

The Cut always had them when I needed spares. hey ho.

Spoke to soon. Got confused thinking I had called SBC but I hadn't. Thanks for the suggestion.

Me again, can someone ( @mdcc_tester ?)tell me if I'm correct in the following:

Trying to determine what the theoretical tension balance between DS and NDS spokes should be on a dished rear wheel:

Hub dimensions are:

Driveside PCD 50.6mm
Non-Driveside PCD 38.5mm
NDS Flange-to-Center 37.8mm
DS Flange-to-Center 16.2mm

Sketched that up with an ERD of 596mm (see attached pic) and I get the angles of the spokes to the verticals to be:

DS 3.39deg
NDS 7.71deg

Resolving horizontal tension on NDS spokes, T_nds = sin(3.39)/sin(7.71) * T_ds
T_nds = 0.44 * T_ds

Is that correct? So if I were to get my DS spokes to 120kgf and NDS to 53kgf I should have a perfectly dished wheel.

1 Attachment

Assuming the same number of DS and NDS spokes, looks good.