|   New To Tinkering | bis
Jan 9, 2004 12:21 PM | | OK guys go easy....in plain English please, rode bikes for ages but now lots of spare parts hanging around and lots of spare time so now gonna start tinkering. Got a quality specialized rockhopper comp disc frame in black for £30 (bargain) the other day with a bb fitted? I think it a shimano UN52? square tapered job, need some hints on whether its gonna last the course....and what type of crankset etc to fit, anything recommended? nothing too expensive. Dont really want to start ripping it out but everyone I speak to are ranting on about the ISIS. Cheers bis |
| re: New To Tinkering | bis
Jan 9, 2004 12:48 PM | | Sorry I should have placed in 'beginners' |
| re: New To Tinkering | logbiter
Jan 9, 2004 2:07 PM | | the UN-52 is a decent BB. if it turns smoothly you are good to go! If it's crunchy, best to replace it.
-you'll need to measure the spindle length/width... should be either 107mm, 110m or maybe 113mm long. Different cranks have different recommended spindle lengths, but most are 107 or 110.
that should work with the majority of compact cranksets (most common crank configuration whether 5arm or 4arm)... it was probably originally spec'd with either something like a Shimano deore or lx crank, but more likely a Specialized strongarm crank.
Shimano is well known to shift the best, but truvativ, middleburn, etc shift well these days. Best bang for your buck in the shimano line is LX, but you'd have to keep an eye out for old stock to get a square taper.
Post with any specific questions and hope this helps.
Serge |
| Thanks Serge.....I think one of...... | bis
Jan 9, 2004 2:33 PM | | I think one of the lads has a deore knocking around......another thing, there is a sort of white cup thingy with a serated inner on the left hand side of the bb sitting about 2/3mm off the frame, do ya know what this is? and is it seated correctly? Thanks Serge |
| sounds like the BB cup? | logbiter
Jan 9, 2004 11:26 PM | | although the white part of your description has me a bit confused.. the cup threads into the frame, and is usually aluminum, serrated/notched (for the proper tool to fit into) and silver, so I'm not sure if I'm on the right track. Assuming we ARE talking about the BB cup, it's not unusual for it to be slightly outside or inside the frame.
You will need a tool like the Park BBT-2 (or another brand that fits most cartridge bottom brackets) to remove or adjust the BB.
here's a good site to check for getting you on your way with tinkering, the Park Tool site http://www.parktool.com/repair_help/FAQindex.shtml
Also check out Mike T's FAQ page.. http://www.execulink.com/~dtierney/wmc/faq.htm
post specific questions and we'll get back to ya.
until prolly Mon or Tuesday on these boards...
Serge |
| 17 bikes in my garage, all w/square taper BB spindles | club
Jan 9, 2004 5:31 PM | | Been riding bikes since the 60s, 50s if you count tricycles, and only ever broke one BB spindle and that was a Campy super record ti spindle, on the track, in a full on sprint, and those were weak CP ti, not the way better alloys we have today. ISIS should be more rigid by virtue of its larger diameter, but for most folks, the difference is negligible or meaningless, as few folks have the strength to flex a steel BB spindle enough to matter. I would think their best application would be in tandems and track bikes, those are bikes that see enough horsepower to do some flexing. |
| Cheers guys | bis
Jan 10, 2004 3:03 PM | | club - couple of mates who have the isis, both ended up with snapped tubes on frame.....good makes too. serge - yeah it might be silver, currently renovating kitchen so poor light in there at the moment.....yeah I know Mike T, cool guy. I didnt realise his expertise went as far as drive trains too, I know hes a Maggies pro. Thanks youve been a big help - bis |
| Been riding since the 70s, and while I've seen broken and bent.. | DeeEight
Jan 11, 2004 3:46 AM | | Ti square-taper spindles (even modern 6/4 ones), they were the typical JRA fables that did them in. One guy I know bent a syncros spindle while riding concrete stairs. Another snapped the end off a russian made spindle, but to do that he landed a jump ONTO a rock, touching down with the end of the left crankarm first (in a downward position) several inches before the wheels made contact with the ground. All the torque from the jump went to the weakest point in that equation and it was the Ti BB spindle. I myself went FOUR years on the same version russian Ti spindle without a hickup (actually went thru several sets of cartridge bearings too).
I only use an M950 XTR Splined BB in one bike, because I had a set of Adventure Components cranks that were Ver1Octalink splined I wanted to use with a 58/110 spider. |
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