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Ultegra splined crank, single chainring?(12 posts)

Ultegra splined crank, single chainring?bigdave
Nov 5, 2002 2:43 PM
Is this a workable combo?

I'd like to add a new crank/bb to my fixed-gear, and only want to run 1 front ring. Can I do this on a splined Ultegra crank with just, say, the addition of shorter chainring nuts? (Brandford bike sells smaller ones.)


Dremel tool, cutting wheel and one chainringbrider
Nov 5, 2002 2:52 PM
Sure. Don't need to necessarily buy new chainring nuts (and bolts, BTW). You can cut a set down with a cutting whell on a dremel tool. Use the inside position if you're running a 44 or less. Easier chain line.
A short bolt set was only 5 bucksStraightblock
Nov 5, 2002 4:23 PM
at the BMX shop down the street when I converted my old Stumpjumper to single speed. Cheap & easy if you don't have the tools to cut 'em down, or even if you do. Or you can go really cheap & put flatwashers on the nuts to shim the extra space. I did this on a beater fixie project bike I just finished & it worked fine. Might be a problem with the washers hitting the chain on some combinations of small chainrings on a large bolt circle, though.
I got raped! paid 16 bucks at the LBS nmbigrider
Nov 6, 2002 11:18 AM
Why limit the inside to 44 teeth or less?....TFerguson
Nov 6, 2002 8:09 AM
The "big ring" will bolt to the inside of the spider. Why do you limit this to 44 teeth? Will they hit the chain stay on some bikes?
Chainstay munchingbrider
Nov 6, 2002 10:34 AM
At least on most race-oriented bikes, the clearance between the chainstays and the inner chainring is pretty small. If you've got the Serotta S-bend stays it may not be much of a problem. Also, for running 700 wheels, a 44 chinring is going to get pretty tall with anything less than an 18T cog (IMO). I run a 44/17 on my SS commuter, but it's got 650s (could probably go up to a 45, but I'd prefer to keep it low).
Works fine......Dave Hickey
Nov 5, 2002 4:25 PM
If you're running a fixed rear wheel, you'll have to mount the chainring on the inside to get the proper chainline. Excel Sports sells a chain guard that would go in place of the large ring. It's not necessary but it gives the crankset a "finished" look. If you don't want to go to that expense, just buy some short stack BMX chainring bolts(about $5.00) and mount the chainring on the inside.
or if you want to go the expensive route............Dave Hickey
Nov 5, 2002 4:31 PM
I found this carbon chainring guard for only $79.99. It's availible in 42T size Shimano bolt circle.
or if you want to go the beautiful route............Ahimsa
Nov 5, 2002 5:40 PM

$32 Washingtons apiece.



Purty, but as a dumb ol' trackie, I like the raw exposed teeth look! -nmTig
Nov 5, 2002 6:32 PM
Thanks again gents...bigdave
Nov 5, 2002 7:06 PM
I suspected it could work with shorter bolts and nuts. I finally got my d@nm old fixed cup off the frame (using Sheldon Brown's method... boy, I had to tighten the bejabbers out of that bolt with a breaker bar as tight as my 220lbs could crank it before the fixed cup budged... sheesh!)

So now I'm ready to slap the BB and crank on... I'll hit the LBS to get the BMX ring bolts.

Thanks again!
Post a picture of the project when finished nmbigrider
Nov 6, 2002 11:21 AM