qtpiesexalicous

i have a sugino 75 bb that came with the frame, so i'm assuming it was used with the previous set up obviously including whatever cranks were on it. i installed sugino 75 cranks and the spider rubs against the chainstay. are sugino 75 cranks set farther into the frame? is there any way i can make this work or do i need a new bb or cranks?

dmg

I'm guessing the bearing cages in the BB are in backwards. Those cranks and BB should be perfect, unless the cranks were deformed prior to your getting them.

trons

what cranks were on it before? what frame is it?
ps. the adjustable cup wouldn't go in as far as it should (that is- you would be able to tell) if the bearing cages were in the wrong way...

qtpiesexalicous

bought a vivalo frame that came with a sugino 75 bb. don't know anything about the history of the bike or its setup. the cranks are new. bb lockring is on the non driver side and both bearing cages are tight to bb shell of the frame. is it possible to use some sort of spacer on the drive side and a longer spindle; is this necessary to use a longer spindle? are sugino 75 spiders inset more than other cranks?

dmg

Dunno about other bottom brackets, but I definitely put the bearings in the wrong way when I was rebuilding my Superbe BB with 75s, and it caused the spider to hit the chainstay. For reference, the 'open' side should go against the spindle and the 'closed' side should go against the cup, as shown in figure A. below:

I would pull out the BB and check the bearings (or take it to a shop and have them do it). It's possible that the previous owner wasn't paying attention the last time he or she worked on it. But, yeah, if the cranks are new and it's a Sugino 75 BB, the cranks and BB should be perfect if installed correctly, no workarounds needed.

yahnming

DMG is right about the bearing retainers. if it's a sugino 75 the spindle should be 109mm, with a sugino 75 crank, it should run perfectly. check the orientation of your retainers.

sneaky viking

dmg, you have very tarck grease.

qtpiesexalicous

the cranks fit the bottom bracket, the problem is the spider hitting the chainstay, which is a frame geometry issue. i think i'm going to try a bottom bracket with a longer spindle.

na975

put a dent in the chainstay,i had to do that on my frame also with the sugino 75 BB, works great now!

dooktruck

make sure and hit it really hard

na975

no, just dent the chainstay it's cheaper solution believe me..

FKMTB07

Dimple the chainstay (carefully!!!). This was a fairly common thing to do "back in the day" and for some reason frames are dimpled these days. I blame the increased Q-factor (and therefore spider width) of newer cranks these days.

I had to dimple the chainstay on my Mark V to get a set of Omnium track cranks to fit. It's pretty lame of IRO to have a "track" frame that doesn't fit a pretty typical track crank. But it was as easy fix.

Bolt a hub or wheel into your dropouts before you go smashing/squeezing away. And go slowly, don't overdo it. That being said, give your cranks a millimeter or so of clearance, so nothing touches if/when your frame flexes.

operator

And this would be one of those times where you toss stupid bearing retainers and pack it loose. Then there is absolutely no question on right or wrong way to put in those idiotic inventions.

na975

that lil > on the BB goes which side? drive or the other side?

dmg

That's actually a pic from retired poster '165' / 'pitboss'. RIP knowledgeable members of BF; we will mourn you 'til we join you (in abandoning this cesspool of misinformation).

dmg

No, no, no. It should fit fine; you are literally using the BB that that crank was made for. Take it out and check the bearing installation. The bearing is not taking up as much space as it should be, meaning that you are shifting the spindle closer to the shell, which is why the spider is hitting.

Or saw the ****ing chainstays off like these other maniacs are recommending, I don't really care.

dooktruck

if you're using a 75 BB and 75 cranks on a vivalo and it doesn't work you're doing something wrong
they should all work together duh
take your bike to a good mechanic

or hit it really hard with a 2 pound sledgehammer