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Im not sure the 60mm GB will fit as nicely and the 50mm will be a tad narrow, in an ideal world I'd have black guards as well. Will mull it over a for a bit longer. 53mm Bluemels might do the job if I can source one of those extender things you used. What are they called again, rack extenders?
Saffronspokes-
60mm should fit well on a disc trucker, have you measured the stay with a caliper to be certain?
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Quick search and I found this;
Howdy! Thanks for the question. In our experience, 60mm Berthoud fenders are just a little bit too tight of a fit on the 700c Truckers to be ideal. They can be mounted but require a pretty significant pinch at the chainstays and between the fork legs. A 2.25″ tire is pushing the limits of what the Trucker will clear, even without fenders. IF you’re looking to go that wide you’ll almost certainly need to leave the fenders off. We typically recommend a 40 or 42mm (~1.5″ to 1.75″) tire with a 50mm fender as the sweet spot for the Trucker. I hope this helps! Feel free to call the shop or email me directly if there is anything else I can do to help!
I think 53 or 55mm is indeed a better fit.
edscoble
They're very expensive whether a new GB mudguard is a much better value.
I got them from bike24.