Wheel work again today (abbreviated hereinafter).
Continuing from the previous post.
I rebuilt the rear wheel from that crappy Nagano shop's excuse for a wheel.
Just like the front wheel, I found several nipples on the inner rim edge that were stripped—twisted and mangled.
A temporary center measurement shot separately from the one I took for the front wheel article.
When I measured the offset amount, it came to about 3.5mm—roughly equivalent to two 500-yen coins (1.8mm thick each).
If they'd gone all-in and offset it by a full 12mm, they could've at least claimed it was for Cannondale's AI offset system.
As I mentioned in the front wheel article, the rim being offset to the non-freewheel side does have one advantage—it narrows the left-right spoke tension difference—but even so, when you grab the final crossover on this crappy wheel, it's just soft and mushy.
Luckily, the valve hole orientation was correct—unlike the front wheel.
The radial runout was terrible too.
In the image above, I'm just barely touching the gauge at the position where the rim deflects outward the most, but
with the gauge position unchanged, at the phase where it deflects inward the most, there's this much gap ↑.
Hard to convey in photos, but this is serious radial runout—the kind where even spinning the wheel in your hands without the truing stand, you can see the rim visibly bouncing and flexing.
You'd think runout this bad would be noticeable when riding, but since it wasn't running rim brakes and had a cyclocross tire with a larger cross-section and lower pressure compared to a road bike, the deformation of the tire contact patch was probably large enough to mask it.
I rebuilt it.
Almost forgot to mention: the original excuse for a wheel had the left and right spoke lengths differing by about 2mm (1.77mm by my calculations), yet they lazily used spokes of the same length for both sides.
FH-RS470 28H semi-CX sprint
46-tooth JIS lacing with hub and rim bracing.
Continuing from the previous post.
I rebuilt the rear wheel from that crappy Nagano shop's excuse for a wheel.
Just like the front wheel, I found several nipples on the inner rim edge that were stripped—twisted and mangled.
A temporary center measurement shot separately from the one I took for the front wheel article.
When I measured the offset amount, it came to about 3.5mm—roughly equivalent to two 500-yen coins (1.8mm thick each).
If they'd gone all-in and offset it by a full 12mm, they could've at least claimed it was for Cannondale's AI offset system.
As I mentioned in the front wheel article, the rim being offset to the non-freewheel side does have one advantage—it narrows the left-right spoke tension difference—but even so, when you grab the final crossover on this crappy wheel, it's just soft and mushy.
Luckily, the valve hole orientation was correct—unlike the front wheel.
The radial runout was terrible too.
In the image above, I'm just barely touching the gauge at the position where the rim deflects outward the most, but
with the gauge position unchanged, at the phase where it deflects inward the most, there's this much gap ↑.
Hard to convey in photos, but this is serious radial runout—the kind where even spinning the wheel in your hands without the truing stand, you can see the rim visibly bouncing and flexing.
You'd think runout this bad would be noticeable when riding, but since it wasn't running rim brakes and had a cyclocross tire with a larger cross-section and lower pressure compared to a road bike, the deformation of the tire contact patch was probably large enough to mask it.
I rebuilt it.
Almost forgot to mention: the original excuse for a wheel had the left and right spoke lengths differing by about 2mm (1.77mm by my calculations), yet they lazily used spokes of the same length for both sides.
FH-RS470 28H semi-CX sprint
46-tooth JIS lacing with hub and rim bracing.