AI quick summary
- Dish is the rim's centered position between the hub locknuts — off-dish wheels ride crooked in the frame even when perfectly true.
- The flip-and-check method on a Park WAG-4 catches dish errors that a truing stand alone will miss.
- Asymmetric rim beds (3T Moto, Light Bicycle AM935) have offsets — measure from the bed center, not the rim edge.
- Boost 148x12 hubs added 11mm to the rear, but old non-boost dishing skills still apply with different flange geometry.
/ 01
What dish actually means
Dish is the lateral centering of the rim relative to the hub locknuts. A properly dished wheel has equal distance from each locknut face to the centerline of the rim. On a rear wheel with asymmetric flange spacing (driven by the cassette), this means drive-side spokes are tighter than non-drive. Without correct dish, the wheel sits crooked in the frame.
/ 02
Symptoms of an off-dish wheel
A wheel off-dish by 2mm will rub one chainstay under load, pull to one side under braking, and wear one tire shoulder faster than the other. New wheel builders often mistake it for a truing problem and chase their tail for hours, truing and retruing without ever getting the wheel to sit straight.
/ 03
Tools: the dishing tool
The Park WAG-4 dishing tool (about $45) is the standard. It's a U-shaped frame with two contact points and an adjustable center indicator. Cheaper plastic versions work but flex; you'll get inconsistent readings across the same wheel, which defeats the purpose.
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The flip-and-check method
Mount the wheel in the truing stand. Note the gap between rim and the left and right caliper arms. Flip the wheel (swap which side faces the drive side). If the dish is correct, the same gap appears on the same side. If the gap swaps sides, you're off-dish by half the difference.
Example: the wheel has a 2mm gap right and 4mm gap left. Flip it. Now it reads 4mm right and 2mm left. The rim moved 2mm when you flipped, so dish is off by 1mm toward the original 'right' side. Tighten the spokes on the opposite side by 1/4 turn each and recheck.
/ 05
Correcting dish without losing tension
Never fix dish by loosening all spokes on the wrong side — that drops overall tension and the wheel goes sloppy. Instead, tighten spokes on the side you want to pull toward, working in 1/4-turn increments across the whole wheel. After every pass, recheck dish and recheck true. Tension follows dish; you can't separate them.
/ 06
Special cases and common errors
Common dishing symptoms and fixes
| Symptom | Cause | Fix |
|---|---|---|
| Rub on right chainstay | Rim offset left 1-2mm | Tighten DS spokes 1/4 turn each |
| Brake pad rub one side | Dish off + rotor not centered | Dish wheel first, then rotor |
| Wheel pulls under braking | Off-dish + tension spread | Equalize tension, then dish |
| Tire shoulder wear asymmetry | Long-term dish drift | Re-dish, re-tension, rotate tire |
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