Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-24-09, 12:54 PM   #1
seanile
Sheriff of Nottingham
Thread Starter
 
seanile's Avatar
 
Join Date: Jan 2009
Location: Boston
Bikes:
Posts: 188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Crankset doesn't fit bottom bracket

I got a 170mm sugino xd 46t crankset and a shimano bb-un54 bottom bracket 110mm for a 68mm bb shell.

the crankset doesnt fit all the way down the tapered spindle, leaving a good centimeter to go before they fit flush against the bb.

how can i get the right size crankset? what numbers am i looking for?
seanile is offline   Reply With Quote
Old 01-24-09, 01:00 PM   #2
larsalan
Senior Member
 
Join Date: Dec 2008
Bikes:
Posts: 128
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
sounds like it fits.
larsalan is offline   Reply With Quote
Old 01-24-09, 01:08 PM   #3
peabodypride
No plan.
 
peabodypride's Avatar
 
Join Date: May 2007
Location: PA
Bikes:
Posts: 2,744
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by sreilly845 View Post
I got a 170mm sugino xd 46t crankset and a shimano bb-un54 bottom bracket 110mm for a 68mm bb shell.

the crankset doesnt fit all the way down the tapered spindle, leaving a good centimeter to go before they fit flush against the bb.

how can i get the right size crankset? what numbers am i looking for?
The gap is perfectly normal.
peabodypride is offline   Reply With Quote
Old 01-24-09, 01:10 PM   #4
seanile
Sheriff of Nottingham
Thread Starter
 
seanile's Avatar
 
Join Date: Jan 2009
Location: Boston
Bikes:
Posts: 188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)


really? if so, awesome
seanile is offline   Reply With Quote
Old 01-24-09, 01:13 PM   #5
peabodypride
No plan.
 
peabodypride's Avatar
 
Join Date: May 2007
Location: PA
Bikes:
Posts: 2,744
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Actually, I lied. You need a 103mm bottom bracket for a good chainline. Also, the BB isn't in all the way. So, you will have some space, but that BB is too long.
peabodypride is offline   Reply With Quote
Old 01-24-09, 01:14 PM   #6
seanile
Sheriff of Nottingham
Thread Starter
 
seanile's Avatar
 
Join Date: Jan 2009
Location: Boston
Bikes:
Posts: 188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
****
seanile is offline   Reply With Quote
Old 01-24-09, 01:38 PM   #7
seanile
Sheriff of Nottingham
Thread Starter
 
seanile's Avatar
 
Join Date: Jan 2009
Location: Boston
Bikes:
Posts: 188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i have a 130mm rear spacing if that helps narrow down what kind of bttm bracket i need
seanile is offline   Reply With Quote
Old 01-24-09, 02:16 PM   #8
dmg
Beautiful Member
 
dmg's Avatar
 
Join Date: Sep 2004
Location: Pittsburgh PA
Bikes:
Posts: 653
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Spacing isn't an issue with chainline - it's the hub that matters. If you have a normal track hub you want a 42mm chainline, which would be a 103mm BB spindle, even if it's spaced out to 130 (it matters where the cog is, not where the chainstays on the frame are). If you have a bigger hub like the surly 135mm hub, that has a 47mm chainline so you'd want a 108mm BB spindle or something close to that. Also, there's about 5mm of difference between the inside and outside of a double crankset, so if you have the ring on the outside of the spider, you can move it to inside and be 2mm off with your current BB, which really won't cause any issues.

One way or another, make sure the cartridge unit is tightened as far as it'll go. If the loose cup side doesn't thread in all the way it's fine.
dmg is offline   Reply With Quote
Old 01-24-09, 02:17 PM   #9
mr_macgee
Senior Member
 
Join Date: Mar 2007
Bikes:
Posts: 347
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You have a JIS BB with a JIS crank, that sounds fine. Sugino xd requires a 103mm BB with the proper torque (approx. 350 inch/pounds) on the crank bolt to get a 45mm chainline. You have 110mm bb that may not have enough torque, this will put your chainline way outside of normal. 130mm spacing shouldn't matter if the wheel was properly built up for fixed gear (42mm chainline). 1st Check/measure the chainline at the wheel, when you know what number that is then you'll have a better idea what to do next. Make sure the cranks have the correct amount of torque. As stated in post above, you most likely need a 103mm BB and the gap of non drive side is normal But I would add that since there is no lock ring for this BB, be careful that it has not come loose.

Last edited by mr_macgee; 01-24-09 at 02:23 PM.
mr_macgee is offline   Reply With Quote
Old 01-24-09, 02:35 PM   #10
seanile
Sheriff of Nottingham
Thread Starter
 
seanile's Avatar
 
Join Date: Jan 2009
Location: Boston
Bikes:
Posts: 188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
excellent, that really helped me out..i read around on some other forums and i do need a 103mm..thats kinda whats required with that model crank..and its a flip flop hub...anddd i just measured the chain line to be in between 40mm and 45mm

thanks for everything guys, much appreciation
seanile is offline   Reply With Quote
Old 01-24-09, 02:42 PM   #11
Prime
Senior Member
 
Join Date: Nov 2007
Bikes:
Posts: 150
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Did you tighten your crank bolts yet?

If you didnt, your crank arms will come in closer...
If you did, need a shorter bb.
Prime is offline   Reply With Quote
Old 05-18-09, 06:15 AM   #12
lerakd
Wreckless in Noo Yawk
 
lerakd's Avatar
 
Join Date: Feb 2005
Location: Westchester
Bikes: Vigorelli
Posts: 20
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I just put a 110 on my 68 and on the non-drive side the crank is about 1 centimeter away. I've tightened everything and it won't get closer. The drive side is tight. If I went for a narrower BB, say a 108 or a 103 I am concerned that the drive side would be too close and the inner ring would hit the chain stay.
lerakd is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 11:25 AM.