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I used WM3 width front and rear, the minimum required width for the tyres I'm using. At the time that was the widest flanged alloy rim that Devon Wheel could offer. We discussed the Avon table and he assured me that the WM3 would be fine, and as Nigel suggested, might look better than wider rims on the Vincent.

I have really cranked the bike over and tossed it side to side on many occasions, no problem at all.

I'm not sure what I would do today faced with making the same decision.

2.5" flanged alloys are available now, so it would be a tough call. Do the 2.5" come with safety beads? If so this would permit tubeless conversion.

I'm not sure if that is a great idea either.

I've done the conversion on the Thruxton R but it started to leak after 2 years. In checking around I found that this is quite a common problem with tubeless conversions. At the moment I've added a sealer sold by Outex, the tubeless conversion supplier. It is working but time will tell.

Glen