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vpCogworks-
Thanks! I tried a half link - unfortunately it pulls the wheel a little bit forward and then the tyre contacts the mudguard bolt and locks up...so it seems my magic gear calculation was a bit off as I did not account for tyre clearance issues.
I have a alfine single pulley under chain tensioner in storage, I'll probably add that just to have some peace of mind. The chain isn't coming off at the moment, but once it stretches a little bit I am sure it will be wanting to jump off with every small bump.
Philip_J_Fry
Finished my Paris cobbles commuter. Wheeler mtb frame from the 90s...unfortunately not retro parts after that. 7 speed IGH, dynamo front wheel, swept salsa bend bars, internally routed electrical cabling.