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Old 01-11-17, 11:43 AM   #1
benshares
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Simple/cheap bottom bracket + crankset for a commuter?

Hi all,

I recently damaged the frame on my steel single speed commuter (a Tribe Bicycles Hi-Ten) - I know the guys at tribe and they had a frameset lying around the warehouse that they are selling me at cost, and I'm going to just transfer the bits and bobs over from the old frame to the new one. The one upgrade I was thinking about making was the crankset/bb, but I've only ever done threadless BBs.

I think the current BB is a no-name english threaded one, and I was exploring replacing with a powerspline and SRAM crankset, or saw that I might also be able to do GXP and SRAM? I'm trying to do this for relatively little money, and I'd love some advice.

Thanks!
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Old 01-11-17, 12:02 PM   #2
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Square taper the shimano UN type BB are a common choice ,

for those who buy bikes with threaded BB shells..

UN 26 is only $20ish.. BB-UN26

The plastic left end wont corrode in place like the aluminum of the next higher priced one, potentially, can.




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Old 01-11-17, 12:35 PM   #3
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What "fietsbob" said and I'll add;

If cost is a factor, your local bike shop can get a UN26 copy from a couple of the big cycling wholesale operations that sells for $12-15 in most places.

Square taper cranks are readily available, new or used, tons of different styles available for any type of riding and at at all price points.
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Old 01-11-17, 12:45 PM   #4
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Thanks! Any recommendations on square taper cranksets? seeing a lot of double and triple chainrings, but of course am just looking for a single.
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Old 01-11-17, 01:03 PM   #5
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I'm happy with the Sugino Messenger cranks I got earlier this year. I run those with a Shimano UN-54 BB and I have about 1200 miles on that setup on a 1x9 gravel bike build(narrow chainring). Wouldn't mind getting one of the alloy cups for the Shimano BB as I have cracked the plastic one before. I wouldn't cheap out too much on the cranks.
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Old 01-11-17, 01:13 PM   #6
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UN 55 square taper is better quality than the 26 and only about $16. If you aren't concerned about weight, there are some Sunlite brand cranksets running about $26.
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Old 01-11-17, 03:16 PM   #7
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I would suggest staying away from the Powerspline stuff. I agree with classic tapered square. There's always Ebay or a local bike recycling effort to source from if retail is too much. Andy
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Old 01-11-17, 03:21 PM   #8
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Origin8 makes a decent looking SS crankset. Origin8 Singlespeed / Fixed gear Crank Set w/46T Ring Silver - Harris Cyclery bicycle shop - West Newton, Massachusetts
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Old 01-11-17, 03:28 PM   #9
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the spindle length has to match the crankset, so get them together as a package
assuming the shop you buy from knows it's stuff..

buying locally lets you exchange mis matches..
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Old 01-11-17, 03:49 PM   #10
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Lots of square taper cranksets show on my local Craigslist, some as low as $20. You can always get one of these and buy a set of short stack bolts ($5-6) and remove one ring. And this looks good if you use the outer ring, OK even with the inner. I've done this on 5-6 bikes, single speeds/fixies, as well as geared bikes. I like running without a front derailleur when possible, and a lot of my day-to-day riding is relatively flat. I like the look and the simplicity.

Sheldon has a page showing cranksets/BB width/spindle width. I can probably find that if you get to the point you need it.

Last edited by sunburst; 01-11-17 at 03:53 PM.
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Old 01-11-17, 03:58 PM   #11
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Interesting! Good to know that you can remove the inner rings - I see lots of nice looking doubles online. What short stack bolts, specifically?
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Old 01-11-17, 04:44 PM   #12
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Quote:
Originally Posted by benshares View Post
Interesting! Good to know that you can remove the inner rings - I see lots of nice looking doubles online. What short stack bolts, specifically?

I see they are called chainring bolts, more commonly.

https://www.amazon.com/Flying-Wheels...ct_top?ie=UTF8

Problem Solvers Chainring Bolts > Components > Drivetrain > Chainring Bolts | Jenson USA

There is a tool to hold the backside in place while turning the topside with an allen key. Nice to have, but with these new bolts, possibly not necessary.
Chainring Nut Wrench | Park Tool


My LBS carries the inexpensive bolts so I've bought them there, as well as online. I've paid $6 but I see that you can pay plenty more.
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Old 01-11-17, 04:57 PM   #13
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Originally Posted by sunburst View Post
My LBS carries the inexpensive bolts so I've bought them there, as well as online. I've paid $6 but I see that you can pay plenty more.
In cycling parts, that is truly shocking!
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Old 01-11-17, 05:19 PM   #14
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There's a lot of info on this page, but I managed to get through it and verify my bottom bracket, spindle and crankset were a match. I was actually trying to advise someone else what to buy to accomplish what I had (ie Japanese crank on a French bike).

http://http://www.sheldonbrown.com/bbsize.html

If you go this route, come back to this page and ask about spindles and offsets. The mechanics here know this stuff better than me, but I might even be able to help.

What worked on my Peugeot with a 68mm BB shell. Spindle #BB-6400, with lug width 68, length 113 (basically something with a size code 3H). Shimano crankset 105-SC 1055. Decent looking crank, imo.
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Old 01-12-17, 09:21 AM   #15
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SS Cranks

How long would you like the crank arms, how many teeth, what color?
The Origin8's are about $90 (4 or 5 colors, 46t) and most any shop can get them.

You can always go with a nice used double and only put one chain ring on it as long as your chain line is OK.

CAMPAGNOLO CRANKSET DOUBLE 39-53T 170 MM | eBay


SS crank.jpg
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