That crank probably needs a 120/122 bb. However, if you run it with a single ring you might get away with a narrower bb.......as your chain line will change ( make sure the non drive side dont hit the chainstay! ). Just remember that without the front mech and on a single ring, be prepared for chain drop, as it may bounce off, off road. You can always use a cheap " narrow wide" ring, but i would probably look at far less than 46.....unless your on very flat/ road or got very good legs!
Nice to see another franken- bike btw.
Nice to see another franken- bike btw.
