keebo

Hi to everyone I'm new here first bike forum & first thread
Why this forum I just google some of my thread title and got good feed back here
I am replacing my Mavic Bottom Bracket square drive as the bearings had gone and the left crank keeps working loose
I've been looking on ebay at second hand parts but I need some ad vive on what will fit our what would be best my bike is from the eighties with 105 equipment

Thanks in advance

operator

You just need to know the type of threading/shell width and spindle length for a replacement. Shimano square taper carts are widely available for ~ $25.

Ex Pres 

105 equipment probably came with either ~ 116 or 119mm spindle length. JIS taper. You should measure your length to be sure. Yours would be an English thread.

keebo

OK thanks so far i've sort of miss lead you all
I have 105 brakes, rear derailer, front derailer, so i would like to fit 105 cranks & rings but without the square drive, our later type B/B with the toughest drive format that the 1.375 dia frame bore can take my old B/B is a 68mm x 116mm

Thanks

operator

If they're not square taper the other two 105 cranks are either octalink or external bottom bracket style. They will both fit on your english BB threaded bike.

keebo

Thanks for this
I bought new eventually from Ribble Cycles sora compact, sm-fc 4500 b/b, KMC chain & the spanner £65.58.
Had trouble removing the Mavic b/b had to bore it out then the bearing cups wouldn't start had to make a left & right hand tap
then I couldn't get the left hand tap to start square so had to re-mount and tap in my milling machine, then it all went back together like a dream, sorted the chain length mounted the bike on the turbo trainer for a test and it was good I like the b/b designe

Thanks