Hi am building up old inbred want to use an old pair of square taper middleburn rs7 cranks, Need to know length of bottom bracket, would 68×113 or 118 be the one. cheers

I believe middleburn recommend 113 for the best chainline with a triple.

however, i know a lot of people have found that far too short, so unless you're running single-speed and/or are a q-factor nut, I'd go 118.

I have rs7s on an Inbred with a 68×113 bb, no problems, but that is with a single ring up front. If I was running a triple I might go longer as there's not much chainstay clearence with the ring.