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That's my point, fitting fatter tyres is impossible with the stock Atlas swingarm. This 4.00 x 18 tyre is wider (4.560") than the old 4.10 x 19 I previously ran. So I have now decided to go back to the 19 with a new 4.10 TT100 and hope the new TT100 is no wider than the old one. PITA because I already put new bearings in the 18" wheel and polished it all up so now I have to do it all again on the 19. But that is Special building. Everything on this Harton project almost fits, but nothing quite fits. Seems like one step forward, two steps backwards all the way. I slapped it together in about 3 weeks 30 years ago. I must have not been as fussy in my yoof as I am now, doing the resurrection! But at least in those days, when you bought a 4.00 tyre it was actully 4.00 to 4.100 wide and fitted the bike as required. The world seems to have gone backwards in the interim.