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Both 801 and 501 will fit, 801 will need the plastic TL FC25 tool which will fit any regular HTII BB tool, basically a step down washer.
Surly says Chainring Clearance 24/36/48t so you should be able to clear quite a bit more than 36T.
Nothing beats actually trying one on though.
What's currently on there?
Photo of full biek?
coventry_eagle-
Surly says Chainring Clearance 24/36/48t so you should be able to clear quite a bit more than 36T.
They don't say what chain line, but I'm guessing 50mm for the middle ring as that's a traditional MTB triple.
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There's nothing currently installed. It was only after taking off the Middleburn square taper 32T cranks and removing the BB that I suddenly thought "hmm, I wonder how wide that BB shell is?" and that's when it dawned on me that the cranks were for 68mm and the shell measured 73mm.
gbj_tester
hippy
Cool. Well, I now have 3 sets of cranks for the Surly and a couple of BB and chainring options. :)
It says it wants BB-MT801 but is the 501 the same thing just cheaper or do I need a different BB too.
EDIT: Just looked and I did buy a 73mm MTB BB for the GRX cranks. Maybe I bought them at different times and just wasn't thinking straight at the crank purchase time.
I presume there's a way I can work out what my chainring size limit will be? ie. approx how wide will the chainring sit + diameter of 38T ring or whatever?