Ask Scrod
#2201
Thread Starter
Your cog is slipping.



Joined: May 2009
Posts: 26,053
Likes: 100
From: Beverly MA
Bikes: EAI Bareknuckle
My protype BB came in the mail today and I installed it. I've never installed a crankset before, but it was pretty straightforward. My question is about the spindle/crank arm interface. I have maybe 4-5mm of spindle showing between the crank arm and bottom bracket shell. I can't seem to push the crank arm down the spindle any further. Is this how your 75/protype bb setup looks?


Last edited by Scrodzilla; 12-31-11 at 08:42 AM.
#2202
Veteran Racer


Joined: Jul 2009
Posts: 11,854
Likes: 913
From: Ciudad de Vacas, Tejas
Bikes: 34 frames + 80 wheels
Also, that's a very common situation with ISO taper spindles, which have a much longer taper section than JIS spindles. Even if an adjustable cup with an external lockring is used, there will be a noticeable gap between the crank arm and the cup / lockring. The installation on my Protype / Sugino 75 looks just like the photo. You should always tighten the crank arm bolts based on torque, and the value I always use is 400 in-lbs (33 ft-lbs) for square taper spindles.
#2203
Is there another reason besides price that most go for the protype bb for 75's; like sealed vs loose ball etc? About to buy a set of Sugino's with the matching BB, and if I can get it for cheaper without causing problems that would be great. I was also looking at these for the crank set, Campagnolo – Centaur BB.
#2204
Thread Starter
Your cog is slipping.



Joined: May 2009
Posts: 26,053
Likes: 100
From: Beverly MA
Bikes: EAI Bareknuckle
I chose the Protype because it's got sealed cartridge bearings and would rather not be bothered with needing to service my bottom bracket.
#2207
Thread Starter
Your cog is slipping.



Joined: May 2009
Posts: 26,053
Likes: 100
From: Beverly MA
Bikes: EAI Bareknuckle
#2212
Thread Starter
Your cog is slipping.



Joined: May 2009
Posts: 26,053
Likes: 100
From: Beverly MA
Bikes: EAI Bareknuckle
Stay home and Netflix the original Swedish trilogy. It was better anyway.
#2216
My little brother is 15, 6' tall, 120 lbs. I try to get him more enthusiastic, maybe interested in racing. His first ride was over 20 miles at around 17/18 mph. He could be a killer climber
Scrod, how do I get a 15 year old really interested in more than just slow party rides? I don't want to force him and give him a bad taste because I pushed him a little too hard.
Scrod, how do I get a 15 year old really interested in more than just slow party rides? I don't want to force him and give him a bad taste because I pushed him a little too hard.
Last edited by hairnet; 12-31-11 at 02:19 PM.
#2220
Oh, well congratulations for being able to save that much. If I ever got to that point, I probably would be afraid to spend it
#2222
Stock market is cheating. get a real job and learn the value of a hard days work.
but srsly, thats pretty dope.
but srsly, thats pretty dope.
#2224
yoked
Joined: Jan 2011
Posts: 3,594
Likes: 1
From: S
Thanks. I can't say I disagree; however, the stock market helped me pay for around $1100 dollars of the bike.




