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


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 07-12-09, 09:05 PM   #1
knzn
Senior Member
Thread Starter
 
knzn's Avatar
 
Join Date: Aug 2008
Location: Wichita Kansas
Bikes: 1 comfort bike, a 1988-ish Rockhopper Comp that I like a lot, and 1 1973 sears 10 speed that needs restored or a new home.And now a Trek 1000.
Posts: 177
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Needing new wheel set

Breaking spokes on my trek 1000 is becoming a trend. The stock 32 count Alexrims AT450 rims aren't up to my 240 lbs. I am thinking about shopping for a new wheel set rather than having all the spokes replaced with a bigger gauge. The Rocky Mountain Cyclrey Mavic A119 rims with Shimano XT M760 hub set and 36 DT 2.0 straight guage spokes at $159.00 for the set have my eye right now but I have just started shopping so any opinions are welcome.

Questions. I am mechanical and not affraid of changing out the cassette, but not sure of special tools needed or what else I will run into if I go this route.

Advise?
Thanks
knzn is offline   Reply With Quote
Old 07-12-09, 09:20 PM   #2
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Bikes:
Posts: 7,978
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
Quote:
Originally Posted by knzn View Post
Breaking spokes on my trek 1000 is becoming a trend. The stock 32 count Alexrims AT450 rims aren't up to my 240 lbs. I am thinking about shopping for a new wheel set rather than having all the spokes replaced with a bigger gauge. The Rocky Mountain Cyclrey Mavic A119 rims with Shimano XT M760 hub set and 36 DT 2.0 straight guage spokes at $159.00 for the set have my eye right now but I have just started shopping so any opinions are welcome.

Questions. I am mechanical and not affraid of changing out the cassette, but not sure of special tools needed or what else I will run into if I go this route.

Advise?
Thanks
I suspect that the original wheels were never properly tensioned. What you have should be adequate for your size, provided the spokes are tensioned high and even. Having the rear wheel rebuilt with all-new spokes by a competent wheelbuilder should give you years of service.

Here's a previous thread talking about the Alex wheelset:
Ksyrium Equipes vs ALEX AT-450
__________________
Jeff Wills

Comcast nuked my web page. It will return soon..
Jeff Wills is offline   Reply With Quote
Old 07-12-09, 09:42 PM   #3
LarDasse74
Guest
 
Join Date: Jul 2008
Location: Grid Reference, SK
Bikes: I never learned to ride a bike. It is my deepest shame.
Posts: 3,769
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
First - I fear the hub spacing might be too wide for your frame... this can be worked around, but why not buy something that fits right off the bat, right?

Second, having spokes properly tensioned is as important as what model rim or what gage of spoke you have. If you go for a 36 spoke wheel with a decent hub like a Shimano 105, and have it and keep it properly tensioned, you will get many many years of service out of them.
LarDasse74 is offline   Reply With Quote
Old 07-12-09, 09:43 PM   #4
AEO
Senior Member
 
AEO's Avatar
 
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Bikes: Bianchi, Miyata, Dahon, Rossin
Posts: 12,258
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
won't work. those are 135mm rear, 100mm front O.L.D. with 622x18mm rims.
18mm rim = 28mm wide tire minimum.

trek 1000 has 130mm rear, 100mm front and possibly not enough clearance for 28mm tires.
it's possible to respace the 135mm rear to 130mm, and redish the wheel but you'll have to cut the axle so it won't protrude from the dropouts.
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
http://sanfrancisco.ibtimes.com/arti...ger-photos.htm
AEO is offline   Reply With Quote
Old 07-13-09, 05:15 AM   #5
knzn
Senior Member
Thread Starter
 
knzn's Avatar
 
Join Date: Aug 2008
Location: Wichita Kansas
Bikes: 1 comfort bike, a 1988-ish Rockhopper Comp that I like a lot, and 1 1973 sears 10 speed that needs restored or a new home.And now a Trek 1000.
Posts: 177
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
First, thanks for the replys. Yes, since last fall it has been tensioned twice. Once right after I got it. and then after I broke spoke number one. Thats in about 500 miles since my ride time is shared with a couple of other bikes.

Comment about those other bikes. I don't know gauges, but my caliper tells me my other bikes have spokes measuring .80 in diameter. My trek measures .72----fwiw.

I would not have know the difference in hub width. Good information. Thank you.
knzn is offline   Reply With Quote
Old 07-13-09, 08:07 AM   #6
dabac
Senior Member
 
Join Date: Mar 2008
Bikes:
Posts: 5,492
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Quote:
Originally Posted by knzn View Post
Breaking spokes on my trek 1000 is becoming a trend. The stock 32 count Alexrims AT450 rims aren't up to my 240 lbs.
At that weight you're beginning to push things a little, you can't expect anything to work.

Quote:
Originally Posted by knzn View Post
.. I am thinking about shopping for a new wheel set ..
Well, buying complete wheels can often be financially better than having existing stuff reworked. Still, there's no immediate guarantee that what you get will be substantially better than what you have.

Quote:
Originally Posted by knzn View Post
...rather than having all the spokes replaced with a bigger gauge...
It is rare to have spokes break due to overload, it's far more usually fatigue related. Going to bigger gauge is unlikely to be the cure you're looking for. The way to combat fatigue is by having the proper spoke tension.

But if your wheels were poorly tensioned to begin with, then replacing spokes one by one as they break may well turn into a long and frustrating process. Even if you've had the wheel tensioned properly after an earlier failure odds are high that spokes will continue breaking one by one as they approach their fatigue limit.
Whatever "imbalance" in remaining life that the initial botched tensioning caused can never be reset, only frozen - so a one-sided or a complete rebuild may be required.

Quote:
Originally Posted by knzn View Post
... any opinions are welcome...
Tension, tension and tension. You need a rear wheel with high and even spoke tension. At your weight it would be advisable to look for a wheel featuring one or several of the tricks available to even out tension(or the strain if you want to be picky) between the sides. 1.8 mm drive side spokes, and 1.5 mm non-drive is a tested favourite. 36H wouldn't be amiss, but not an absolute must. An off-center rim is another feature that'd tweak the odds of getting a durable wheel to your favour. If you don't like skinny spokes an OCR with 2.0 mm DS and 1.8 mm NDS is another nice combo. Radial spokes (laced heads-out) on the NDS can also improve things, either by itself or in combination with any of the other tweaks.

Quote:
Originally Posted by knzn View Post
.. I am...not afraid of changing out the cassette, but not sure of special tools needed...
You need a chain whip and a splined tool bit for the lockring. A torque wrench or a certain experience can be helpful during reassembly.
dabac is offline   Reply With Quote
Old 07-13-09, 12:18 PM   #7
AEO
Senior Member
 
AEO's Avatar
 
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Bikes: Bianchi, Miyata, Dahon, Rossin
Posts: 12,258
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
don't forget the rim width.
the alex at450 are 18.5mm wide rims with 14mm internal width.
the mavic A119 rims are 22.5mm wide rims with 19mm internal width with minimum 28mm wide tires.

I'm not sure a trek 1000 can handle 700x28mm wide tires.
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
http://sanfrancisco.ibtimes.com/arti...ger-photos.htm
AEO is offline   Reply With Quote
Old 07-13-09, 12:26 PM   #8
xerotope
Junior Member
 
Join Date: Apr 2008
Bikes:
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I was having the same problem with the spokes on the rear wheel of my Trek 1000 (also Alex Rims, although I weigh in closer to 190 lbs). After the third spoke in two months, I replaced them all and rebuilt my wheel in the local bike co-op. I've now gone over a year without trouble.
xerotope 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 03:14 AM.