| Also known as | H4031, LM11910/11900LA |
| Diagram | Fig. 20 — TELESCOPIC FRONT FORK · ref 12 |
| Subsystem | forks front |
| Listed in parts books | 1971–1972, 1974, 1976–1980, 1983, 1985 |
STEERING BEARING OIF SET - NTN JAPAN
Tapered roller steering head bearing set for oil-in-frame Triumph twins, made by NTN in Japan.
This is the steering head bearing set for oil-in-frame Triumph twins, part number 97-4031, also seen in older records as H4031. It's a tapered roller bearing set made by NTN in Japan, and it fits into the steering head where the front forks pivot for turning. The catalog shows it appearing across telescopic front fork listings from the early 1970s through the end of the decade.
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The steering head bearings carry the load of the front end and let the fork assembly swing side to side smoothly. If they wear out or get pitted, steering starts to feel rough, notchy, or like it wants to fall into turns rather than hold a line. This is a wear item that most riders never think about until the symptoms show up.
The alternate number LM11910/11900LA is the bearing industry's own part designation for the same tapered roller bearing used in this set, which is worth knowing if you're cross-shopping bearing suppliers directly. If you're not sure whether your frame is the oil-in-frame type this set is built for, give us a call before ordering.
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