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you tapped the axle of your front Shimano hub conversion to run a rear 6 bolt cog on your Cervelo.
No, the Cervelo is still using a rear hub with a screwed on sprocket. On the other hand, it is attached to the bike with M6 threads tapped into a Shimano axle, so your memory is half right 🙂
As I think I've explained before, M6 is plenty strong enough for a front hub, and the tap runs into the QR bore with no need to drill or ream. At the back, it's fine on a road bike with vertical dropouts but in track ends you should use chain tugs to react the chain tension as the bolt clamping force is not much better than a QR.
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any Idea where to get these domed washers?
I'm after some like on the Surly hubs for the Genesis branded hubs that came on my Day 1
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gbj_tester
harv4130
@coventry_eagle
@gbj_tester IIRC you tapped the axle of your front Shimano hub conversion to run a rear 6 bolt cog on your Cervelo.
What thread? M6 or M8?
I'm gonna use it on the front, IIRC M6 is the right one with some dome washers (correct?).