| Listed in parts books | Not catalogued by year yet |
WHEEL SPACER,B50 MX REAR
Rear wheel spacer for the BSA B50 MX, part number 37-3909.
This is a rear wheel spacer listed for the B50 MX. The catalog description ties it to the rear axle area, sitting on the hub to take up the gap between the wheel bearing and the fork end so the wheel sits centered and the axle clamps up correctly.
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Worth noting right away: B50 is a BSA model, not a Triumph, even though this part number lives in our Triumph-numbered records. If you're working on a BSA B50 MX and need the rear wheel spacer, this is the part, but don't expect it to interchange with Triumph unit-twin hubs.
We don't have much more history on this one beyond the catalog listing itself. If you're not sure this is the spacer your hub needs, give us a call with your wheel in front of you and we can talk through it before you order.
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