Thread: Type A vs. Type B Down Tube Shifter braze-on bosses
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Old 10-08-23 | 09:53 AM
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JohnDThompson
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From: Appleton WI

Bikes: Several, mostly not name brands.

Originally Posted by Het Volk
I have been trying to find a simple photo that can be easily used to identify the difference between a Type A and Type B braze-on.

in addition, A uses a 5mm screw while a B uses the narrower, uncommon 4.5mm screw.

Note: top frame is Type B, bottom is Type A

I hope this helps



RJ the Bike Guy - Shimano Type B shifter boss
No, the one on top is an "A-type" boss; the one on the bottom is a Campagnolo-type boss. "B-type" bosses are completely different:
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