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i have just replaced my defunct forks with NOS Marzocchi SL Corsa forks - 26", straight steerer, post mount.
however, my disc brakes are old matura marta IS fitting.
i have a 180 rotor.
there is a IS to post mount adaptor available, but this would mean me using a 200/203 rotor as it adds 20mm to the current rotor size.
the forks say max size is 180.
so, what is the most convenient, workable and economic solution to this conundrum?
does 200mm rotor matter with these short travel cross county forks?
should i buy new PM caliper - but still likely to need a 160 rotor, cos i don't think a 180 would fit.
what would people advise?
thanks
I would ignore the maximum rotor size thing. A 180 mm rotor will give enough stopping power to send you over the bars so I don't see how a bigger rotor is going to make any difference to the stresses on the fork.
This seems to be worth a try, it says in the description it “might not” fit but you can return if it doesn’t. It’s a +0 adapter.
https://clee-cycles.co.uk/P1043/product
assuming your forks are 160 post mount then You want the 160-160.
*removed - wrong thread
I got one of those adaptors and it added about 5mm to the rotor size, my 200mm M4 mono is now too big for a 203mm rotor. I doubt the difference between a 180 and a 185 is going to worry anyone if push came to shove.