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Old 09-23-07, 10:21 AM   #1
momboman
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Rehab of Trek 520

Newbie here and an "older" rider so go easy.

I recently acquired a '94 Trek 520. Cosmetically challanged but a steal for the price.
A crank arm had been replaced and I would sooner replace the crankset entirely.
I read the thread from a '05 520 owner wanting to replace the cranks in this forum and want to know if current LX/105 cranksets will fit this 1994 model? Can I put 8-9 speed cassette/wheelset on this bike?

I intend to pull a BoB with this bike, any suggestions?

Thanks for your help.
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Old 09-23-07, 10:25 AM   #2
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I crashed my Trek 520 early on in my big tour, and completely destroyed my Deore LX rear derailleur (pics if ya want ) but I found a 2nd hand 105 rear derailleur. It works fine, but since it is a little too small for my large chainrings, it makes a little noise in the granny gear. Still works fine in that gear though.
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Old 09-23-07, 11:59 AM   #3
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Originally Posted by momboman View Post
Newbie here and an "older" rider so go easy.

I recently acquired a '94 Trek 520. Cosmetically challanged but a steal for the price.
A crank arm had been replaced and I would sooner replace the crankset entirely.
I read the thread from a '05 520 owner wanting to replace the cranks in this forum and want to know if current LX/105 cranksets will fit this 1994 model? Can I put 8-9 speed cassette/wheelset on this bike?

I intend to pull a BoB with this bike, any suggestions?

Thanks for your help.
I'd highly recommend the Sugino XD600 triple, use that with a 107 or 110mm UN-73 bottom bracket and you'll be good. The Sugino crankset can be had for about 75 bucks from Lick bike, and they also have the BB's. Just tell them what your putting it on. I used a 110 on my Surly LHT and the chainline is darn near perfect.

As for the rear, is it a casstte already, or is it 7 speed freewheel? Being a steel frame, you should be able to get a cassette wheel on it. What's the urrent spacing? You can respace the frame if need be.
http://www.sheldonbrown.com/frame-spacing.html However if you're going up 1 size, ie 126 to 130, you can usually just use a little pressure to insert the wheel. However to do it right, look at sheldon's article, it's really not hard to do.
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Old 09-23-07, 03:48 PM   #4
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Thanks Mark,

The Sheldon Brown link was very helpful. I may just put a new wheelset on this bike and being able to go to a 135MM from the existing 130 seems very do-able. I'll probably use a 11-32 8 speed.

I would like to use a Shimano crankset. I don't know whether to use mountain (XT) or road/touring (105/etc) components?

I have thousands of satisfied miles on XT equipment including off road touring on an old Schwinn Cimarron mountain bike, alot of it carrying full loads. Hence I am partial to the XT hardware as it always got me home. This 520 bike will be my first venture into skinny tire touring mounts. Age (mine) is keeping me off the trails and onto harder surfaces.

Thanks for your help.
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Old 09-23-07, 04:30 PM   #5
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Definitely stay with the XT equipment, the mountain triple will let you put on a 22/32/44 set on chainrings which is perfect for loaded touring.
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Old 09-23-07, 05:10 PM   #6
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Don't go with a road triple. I used a Sugino XD600 (46,36,26) and was happy with it. The price is right too. On the transamerica the ratios were fine in the Rockies, but in the Appalachians you might prefer a 24 or 22 inner ring.

Other MTB cranks are fine too, but the road cranks usually only take a a 39 tooth or larger inner ring. That is way too big if you will be in the mountains.

XT stuff is nice I would stick with it especially if you already have it.
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Old 09-26-07, 06:12 AM   #7
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Don't go with a road triple. I used a Sugino XD600 (46,36,26) and was happy with it. The price is right too. On the transamerica the ratios were fine in the Rockies, but in the Appalachians you might prefer a 24 or 22 inner ring.
I don't think you can put anything smaller than a 24 on the XD600. This is quite small, but still...
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Old 09-26-07, 08:09 AM   #8
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I was leaning towards the XD600 as the price is right, and it's a very nice crankset. I have one on my LHT. XT is also good stuff, but it costs more. Also beware that the new XT rear derailleurs don't have an adjustment barrel, so you'll have to do inline cable adjusters if you run bar end shifters. If you go with brifters get campy as shimano are not rebuildable.
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