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Looking for some help
Got a disc road bike with 68mm bottom bracket spacing
A shimano 68/73 mtb bottom bracket
A rotor 3d xc3 crankset
I am struggling to get all this to fit together I seem too have too much or too little axle showing when I go to put the crank arm on
Any ideas?
road and mtb cranksets have different axle lengths even with the same BB spacing (which means I think that the bearing cups are different sized)
I think the cups for Shimano road and mtb bottom brackets are slightly different widths, with road being a mm or so thicker.
Thanks had a look at link but as I am using a MTB bottom bracket with the MTB crank it's appears it should all work but i can't seem to get it right
I am struggling to get all this to fit together I seem too have too much or too little axle showing when I go to put the crank arm on
So you are using spacers? Sounds like you need narrower ones.
If you are using MTB cups should be 1 spacer on one side and 2 on the other - nominally 2 on the drive side, but you can swap them to tweak the chainline. The overall BB width + spacers should measure 73mm though Shimano only seem to provide 2mm spacers these days but 74mm total width is OK.
Sell them and buy some road cranks. Â Why would you want a wider Q Factor when there is no need for one (I.e. to clear the wider chain stays of the MTB)
Why would you want a wider Q Factor
Because he doesn't want to buy cranks, and Q factor is a nonsense?