Other than discs and Hed 3’s, what rear wheels are perfectly symmetrical when looking at the spoke angles on either side.
Follow me? On the cassette side, the spokes are usually angled straight towards the inside of the wheel.
None. Reason? Dish A bicycle wheel should have the rim centered directly in line with the frame. The fork ends are symmetrical with respect to the frame, and the hub axle locknuts (or equivalent surfaces) press against the insides of the dropouts.
Wheels should be built so that the rim is centered exactly between the axle ends on the hub. In the case of rear wheels, the spokes attach to flanges which are not symmetrical…the right flange is usually closer to the centerline than the left flange, to make room for the sprocket(s).
When rear wheels are built properly, the spokes on the right side are made tighter than those on the left side. This pulls the rim to the right, so that it is centered with respect to the axle (and to the frame.) Viewed edgewise, a rear wheel built this way resembles a dish, or bowl, since the left spokes form a broad cone, while the right spokes are nearly flat.
(you MAY be able to build a near dishless wheel with an assymetric spoke-bed rim and a small number of sprockets, like a fixe or single. Note also that lenticular discs are dished as well.)
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fredly,
Didn’t Ritchie make a wheel they called zero dish because the hub flanges were equally spaced from the center of the hub and still allowed room for the cassette on the drive side? This wheel also touted equal spoke tension on both the drive side and the non drive side of the wheel.
Supposedly this was the “perfect” rear wheel. The unequal spoke tension issue was solved. This wheel was supposed to last forever. Does Ritchie still sell them? So much for the “perfect” wheel?
Actually, the spokes were symmetrical length and the rim was not. The design allowed for the same length spokes on either side, but you still had it dished. The non-drive side of the rim was higher than the drive side. It is a good rim, and makes a great wheel.
Ritchey most definitely still sells this rim and wheel.
There was also a hub that addressed this by making the non-drive side larger than the drive side. It may still exist, who knows?
The Ritchey wheels use/used an assymetric spoke bed on the rim - the drive side spokes are, in essence, “dished” at the rim. It’s still dish!
You can make the hub flange spacing closer to reduce dish, but on a wire spoke wheel you face seriously diminishing strength as the flanges approach the center of the hub - at the point that dish goes away, the flanges are so close that there is no longer enough offset from the centerline of the hub for the spokes to support the wheel adequately.
Ritchey tried/tries to combine low-offset hubs with assymetric rim drilling to get as close to zero dish as is practicable. Even so, there is still some “traditional” dish to these wheels…
-snip from Ritchey catalog-
Rear wheels are weak because they’re not balanced—the drive-side hub flange is moved 10mm inward to make room for 8, 9 and 10-speed cassettes, and this means the drive side spokes are at a nearly vertical bracing angle and tensioned 80-100 percent higher than non-drive side spokes. This means your wheel wants to bend. OCR (Off Center Rear) rims help reduce this imbalance by shifting spoke holes 3mm towards the non-drive side of the rear wheel, and the carefully positioned Zero System hub flanges remove the remaining 7mm of dish to reduce the spoke tension imbalance by more than 50 percent. The result is a rear wheel with carefully tuned spoke angles, minimal dish and almost equal spoke tension between the drive/non-drive side, so Zero OCR wheels can be built lighter, but stronger than wheels weighing more
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A track wheel should be symmetric… I think