Another day, another wheel (and so on).
A customer brought in a Prime 28mm high tubular rim rear wheel for service.
I actually just inspected the same wheel the other day, but this is a separate job.
The other one had the tire glued with rim cement, this one was mounted with tubular tape.
Novatec straight-pull spoke hub, 24H.
DT Aerotempo / Aerolight spokes, 2-cross lacing on both sides, but the final cross on the non-drive side isn't woven in.
The customer wants the rear wheel rebuilt using this rim and a hub they're bringing in.
The hub is a Rotor Revolver hub,
with asymmetric flange holes.
The patent marking on the hub shell doesn't refer to the asymmetric hole flange, but rather to the special clutch mechanism in the ratchet system.
A 6-spoke (3-cross) lacing pattern would give the closest tangent-like trajectory, so I'd like to do 2-cross on the drive side and 3-cross on the non-drive side, but...
According to the instructions, 3-cross is only allowed for the drive side when using a 2:1 ratio hub with 2:1 lacing, or for 32H in MTB hubs.I might break that rule if it were my own wheel, but I'll obey the instructions here and do 2-cross on both sides.
Other restrictions stated: it's designed for 14-gauge spokes, so don't use 15-gauge spokes. Also, the spoke routing that results in 1-cross is prohibited—there's a diagram shown, but the "RIGHT" in this context means "correct," not "right side." The opposite term "WRONG" appears right below, so there's no confusion there. The fact that the diagram labeled "RIGHT" shows a left flange might be a deliberate statement that "this RIGHT doesn't mean right side."
In any case, 0-cross (strictly speaking, not truly "radial" lacing, though the instructions call it that) is always forbidden. For 2:1 lacing, 3-cross on the drive side and 2-cross on the non-drive side is specified. This means that with the Revolver, they've realized it's better to make the drive side of the asymmetric lacing pattern as close to true tangent as possible. There was that case years ago with a wheel from a brand with a terrible name—a 2:1 laced wheel that was so uneven the tire rubbed on the frame. When I re-laced that from 4/0 to 6/0 lacing, tire contact problems clearly disappeared. Though the comparison is probably unwelcome, the folks at Rotor are clearly smarter than the folks at that crappy brand.
The reason they only allow 3-cross for 32H is that spoke trajectory isn't determined by the cross pattern alone—spoke count matters too.
Take a 24H 4-spoke and a 36H 6-spoke as examples. If the rim and hub are the same model, these two will have identical spoke trajectories at the final cross. Conversely, even with the same "4-cross," a 36H will have spoke paths closer to radial than a 24H.
Actually, that's wrong. What matches is the "spoke length," not the trajectory. And I've actually posted a correction article on this before (→here). Thanks for the comment.
But it's true that as spoke count increases with the same cross pattern, the angle of the final cross gets narrower.
This is why the Rotor Revolver hub permits 3-cross for 32H. For road 24H 2:1 lacing, the spec is "don't lace anything except 3-cross drive side / 2-cross non-drive side," but for MTB 32H, they say "3-cross is permitted," which means 2-cross drive / 3-cross non-drive, or the reverse, or even 3-cross both sides is possible. Of course, if I were doing it, I'd go with the 4/6 equivalent: 2-cross drive side / 3-cross non-drive side.
Built.
Revolver hub, 24H, black half Comp spokes, 2-cross both sides, black aluminum nipples. I'll true it later.
When I apply the correction factor for the asymmetric hole positions, the calculated spoke length sometimes feels off, but this time the calculation was right. Radians don't lie.
By the way, since I had to disassemble this wheel, I naturally got a chance to weigh the rim. Given how big the Prime brand is, it'd have more public interest than the VCYCLE measurement I shared the other day, but I have no interest in that kind of thing, so I'm not posting it here. Besides, why should I give away that info for free? ↑ Wow, what a jerk.
Sorry for the wait!
Please take a look at this image!
↑ STOP IT!!
A customer brought in a Prime 28mm high tubular rim rear wheel for service.
I actually just inspected the same wheel the other day, but this is a separate job.
The other one had the tire glued with rim cement, this one was mounted with tubular tape.
Novatec straight-pull spoke hub, 24H.
DT Aerotempo / Aerolight spokes, 2-cross lacing on both sides, but the final cross on the non-drive side isn't woven in.
The customer wants the rear wheel rebuilt using this rim and a hub they're bringing in.
The hub is a Rotor Revolver hub,
with asymmetric flange holes.
The patent marking on the hub shell doesn't refer to the asymmetric hole flange, but rather to the special clutch mechanism in the ratchet system.
A 6-spoke (3-cross) lacing pattern would give the closest tangent-like trajectory, so I'd like to do 2-cross on the drive side and 3-cross on the non-drive side, but...
According to the instructions, 3-cross is only allowed for the drive side when using a 2:1 ratio hub with 2:1 lacing, or for 32H in MTB hubs.
Other restrictions stated: it's designed for 14-gauge spokes, so don't use 15-gauge spokes. Also, the spoke routing that results in 1-cross is prohibited—there's a diagram shown, but the "RIGHT" in this context means "correct," not "right side." The opposite term "WRONG" appears right below, so there's no confusion there. The fact that the diagram labeled "RIGHT" shows a left flange might be a deliberate statement that "this RIGHT doesn't mean right side."
In any case, 0-cross (strictly speaking, not truly "radial" lacing, though the instructions call it that) is always forbidden. For 2:1 lacing, 3-cross on the drive side and 2-cross on the non-drive side is specified. This means that with the Revolver, they've realized it's better to make the drive side of the asymmetric lacing pattern as close to true tangent as possible. There was that case years ago with a wheel from a brand with a terrible name—a 2:1 laced wheel that was so uneven the tire rubbed on the frame. When I re-laced that from 4/0 to 6/0 lacing, tire contact problems clearly disappeared. Though the comparison is probably unwelcome, the folks at Rotor are clearly smarter than the folks at that crappy brand.
The reason they only allow 3-cross for 32H is that spoke trajectory isn't determined by the cross pattern alone—spoke count matters too.
Take a 24H 4-spoke and a 36H 6-spoke as examples. If the rim and hub are the same model, these two will have identical spoke trajectories at the final cross. Conversely, even with the same "4-cross," a 36H will have spoke paths closer to radial than a 24H.
Actually, that's wrong. What matches is the "spoke length," not the trajectory. And I've actually posted a correction article on this before (→here). Thanks for the comment.
But it's true that as spoke count increases with the same cross pattern, the angle of the final cross gets narrower.
This is why the Rotor Revolver hub permits 3-cross for 32H. For road 24H 2:1 lacing, the spec is "don't lace anything except 3-cross drive side / 2-cross non-drive side," but for MTB 32H, they say "3-cross is permitted," which means 2-cross drive / 3-cross non-drive, or the reverse, or even 3-cross both sides is possible. Of course, if I were doing it, I'd go with the 4/6 equivalent: 2-cross drive side / 3-cross non-drive side.
Built.
Revolver hub, 24H, black half Comp spokes, 2-cross both sides, black aluminum nipples. I'll true it later.
When I apply the correction factor for the asymmetric hole positions, the calculated spoke length sometimes feels off, but this time the calculation was right. Radians don't lie.
By the way, since I had to disassemble this wheel, I naturally got a chance to weigh the rim. Given how big the Prime brand is, it'd have more public interest than the VCYCLE measurement I shared the other day, but I have no interest in that kind of thing, so I'm not posting it here. Besides, why should I give away that info for free? ↑ Wow, what a jerk.
Sorry for the wait!
Please take a look at this image!
↑ STOP IT!!