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Mysterious (to me) Rear Wheel Problems
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smarauder68



Joined: 09 Mar 2007
Posts: 5365


Location: Salt Lake City

PostPosted: Wed Sep 05, 2012 4:12 pm    Post subject: Mysterious (to me) Rear Wheel Problems  Reply with quote

For the 2nd time in less than 6 weeks, I've had to end a ride because I looked down at my rear wheel and noticed it was spinning in a oblong fashion and moving from side to side about a half an inch or more and actually rubbing the brakes slightly...I had this same problem 6 weeks ago and when I took it to the shop, they said they needed to repair 2 broken spokes...I don't remember banging it anywhere...What can be the cause of this?
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berck
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Joined: 09 Oct 2006
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Location: SF Bay Area

PostPosted: Wed Sep 05, 2012 4:18 pm    Post subject: Reply with quote

Welcome to my world Scott. It has to do with your size. The wheels can only take so much stress before a spoke gets broke or the rim cracks.

There are only two solutions...
1) Buy better wheels that can deal with the added weight. The good news is that these wheels are generally cheaper than racing wheels, but they are also heavier.
2) Lose more weight.
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Last edited by berck on Wed Sep 05, 2012 9:11 pm; edited 2 times in total
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Biosphere
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Joined: 08 Oct 2006
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Location: Der Schweiz

PostPosted: Wed Sep 05, 2012 4:42 pm    Post subject: Reply with quote

3) Stop outputting more power than the drive train is designed to cope with Wink
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berck
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PostPosted: Wed Sep 05, 2012 5:06 pm    Post subject: Reply with quote

Biosphere wrote:
3) Stop outputting more power than the drive train is designed to cope with Wink


Then you break a pedal, crank arm, chain ring or spindle, not the spokes Wink

FYI: I have broke teh spindle before. It happened three years ago. They claimed it was faulty components (Shimano Ultegra), but I know better. Wink
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Boogerd_Fan



Joined: 07 Oct 2006
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PostPosted: Wed Sep 05, 2012 5:53 pm    Post subject: Reply with quote

I was riding a cracked rim for a good 6 months, until it got flagged when i went for a regular service. That was on a Giant OCR 2 from a few years back. Still consider myself lucky not have a catastrophic fail of the wheel at tempo pace, while i was totally oblivious to it!
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smarauder68



Joined: 09 Mar 2007
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Location: Salt Lake City

PostPosted: Wed Sep 05, 2012 9:06 pm    Post subject: Reply with quote

Just back from the shop...Another broken spoke and the hippy dude behind the counter said I probably banged it somewhere....I thought maybe when I scrunched it into my back seat yesterday after my ride, but I suspect its not meant to handle 250 lbs....yes, I've lost another 10 lbs in the past 6 weeks...only 40 more to my goal...probably won't happen until next spring tho.
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Biosphere
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Joined: 08 Oct 2006
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Location: Der Schweiz

PostPosted: Wed Sep 05, 2012 9:39 pm    Post subject: Reply with quote

A good sales man. Picks up on what the customer is thinking and then reinforces it building a rapport and trust. He's probably a Tea Partyite behind the hippy mask Wink

Seriously, you may have banged them or you may not. I got the impression your roads were good quality. If bike shop man keeps rebuilding the wheel and they keep breaking something needs to change. If you trust him and you think he's competent, then discuss your options with him. Weight probably is your problem here. Some discussions I found with quick Google

http://forums.roadbikereview.com/...ely-weight-issue-16695-print.html

http://forums.bicycletutor.com/thread-2788.html

http://bicycling.about.com/od/bikemaintenance/a/spoke_problems.htm
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CapeRoadie



Joined: 15 Oct 2006
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Location: The sandy windswept peninsula

PostPosted: Wed Sep 05, 2012 10:07 pm    Post subject: Reply with quote

Fulcrum wheels.  For the big guys.
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smarauder68



Joined: 09 Mar 2007
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Location: Salt Lake City

PostPosted: Wed Sep 05, 2012 10:12 pm    Post subject: Reply with quote

Biosphere wrote:
A good sales man. Picks up on what the customer is thinking and then reinforces it building a rapport and trust. He's probably a Tea Partyite behind the hippy mask Wink

Seriously, you may have banged them or you may not. I got the impression your roads were good quality. If bike shop man keeps rebuilding the wheel and they keep breaking something needs to change. If you trust him and you think he's competent, then discuss your options with him. Weight probably is your problem here. Some discussions I found with quick Google

http://forums.roadbikereview.com/...ely-weight-issue-16695-print.html

http://forums.bicycletutor.com/thread-2788.html

http://bicycling.about.com/od/bikemaintenance/a/spoke_problems.htm


Interesting that a 210 lb man is considered too heavy in the cycling world....lol...admittedly, I am the biggest man I see riding up these hills around Salt Lake...in fact, nobody comes close to my size...people often look at me on their descent and do a double take when they see me climbing the same road they just conquered. Probably shocked to see someone with NFL lineman size on a bike.
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Biosphere
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Joined: 08 Oct 2006
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Location: Der Schweiz

PostPosted: Wed Sep 05, 2012 10:25 pm    Post subject: Reply with quote

smarauder68 wrote:

Interesting that a 210 lb man is considered too heavy in the cycling world.....


But remember that you're reading road racing forums. There's a different set of standards.

Too heavy for getting out and exercising? Definitely not.
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smarauder68



Joined: 09 Mar 2007
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Location: Salt Lake City

PostPosted: Thu Sep 06, 2012 1:50 am    Post subject: Reply with quote

As I picked up my bike, the hippy guy gave me a lecture on bike handling and how to shift my weight as I go up little bumps from the street into parking lots for example....useful stuff to consider...
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smarauder68



Joined: 09 Mar 2007
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Location: Salt Lake City

PostPosted: Tue Sep 18, 2012 3:27 pm    Post subject: Reply with quote

Broke two more spokes last night....doing a gradual uphill climb on the first and I heard a "poof" and looked down and the wheel was starting to spin a bit wobbly....then on my descent home, "poof" again and the 2nd one went...

I think its time to buy a new rear wheel.
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berck
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Location: SF Bay Area

PostPosted: Tue Sep 18, 2012 5:22 pm    Post subject: Reply with quote

Did you check the warranty with the wheels? Bontrigger has a five year one. They just replace it if you are under the warranty period. Other wheel manufacturers may have similar warranties.
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Biosphere
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PostPosted: Wed Sep 19, 2012 2:44 pm    Post subject: Reply with quote

This bike will take the weight, but I'm not convinced the average bike weighs 14kg

http://www.heraldsun.com.au/techn...iant/story-fn5izo02-1226473443447
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sabcarrera



Joined: 11 Oct 2006
Posts: 290



PostPosted: Wed Sep 19, 2012 5:53 pm    Post subject: Re: Mysterious (to me) Rear Wheel Problems Reply with quote

smarauder68 wrote:
For the 2nd time in less than 6 weeks, I've had to end a ride because I looked down at my rear wheel and noticed it was spinning in a oblong fashion and moving from side to side about a half an inch or more and actually rubbing the brakes slightly...I had this same problem 6 weeks ago and when I took it to the shop, they said they needed to repair 2 broken spokes...I don't remember banging it anywhere...What can be the cause of this?


Modern wheels are very difficult for the local mechanic to respoke.
One of cycling friends lost his wheel and another had to send it back to the factory to be repaired.
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smarauder68



Joined: 09 Mar 2007
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Location: Salt Lake City

PostPosted: Thu Sep 20, 2012 3:17 pm    Post subject: Reply with quote

berck wrote:
Did you check the warranty with the wheels? Bontrigger has a five year one. They just replace it if you are under the warranty period. Other wheel manufacturers may have similar warranties.


Hippy mechanic dude says he's gonna rebuild the wheel and use better (metal) spokes. It's gonna cost me about 60 bucks but he says he'll give me a 6 month warranty on his work.  It's either that or keep replacing spokes every 2 or 3 weeks....I think I noticed that the last two times my spokes broke were on days I pumped up my tires to 80bpm....perhaps the extra air pressure was too much?
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cyclingtv



Joined: 22 May 2007
Posts: 3854



PostPosted: Thu Sep 20, 2012 9:35 pm    Post subject: Reply with quote

80 psi, if anything, is on the low side for someone over 220 lbs..

maybe your popping spokes because the hippy isn't competent..
remember sometimes over torqued spokes pop on minor impacts..

I have 15 years old 16 spoke campi zonda radial wheels and knock on
wood haven't popped a spoke.. I weighed up to 265 lbs and put in 110+ psi..
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CapeRoadie



Joined: 15 Oct 2006
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Location: The sandy windswept peninsula

PostPosted: Fri Sep 21, 2012 12:52 am    Post subject: Reply with quote

I agree with cyclingtv.  I ride 90-120 psi depending on the weather, and I weigh 195 (and dropping).
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Biosphere
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Location: Der Schweiz

PostPosted: Fri Sep 21, 2012 6:13 am    Post subject: Reply with quote

Well it's a hybrid bike so we don't know that he's got road wheels to pump at that PSI. SM, the max PSI should be written on the side wall.
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cyclingtv



Joined: 22 May 2007
Posts: 3854



PostPosted: Fri Sep 21, 2012 11:20 pm    Post subject: Reply with quote

my main point being 80 psi isn't going to pop spokes..

soft tires may contribute and be more prone to
rim impacting uneven pavement which may
lead to tire flats and/or wheel damage, re: spoke
damage and rim impingements..

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