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Old 03-29-08, 06:16 PM   #1
ridingdirty
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Frame unsafe to ride? (pics included)

Picked up a 2001 Sirrus Comp today. I got home and tore it apart to get a better look at what I was working with. Everything was looking good until I took off the rear wheel and noticed the tire had been rubbing on the frame. I wanted to get a second opinion on the condition. There are no holes in the aluminum, it is worn about 1mm down on the seat stay and a little more than 1mm on the chain stay. The patch is about 1/2" across at both locations. Here are some pics.
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Old 03-29-08, 06:21 PM   #2
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Hopefully not an internet buy.
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Old 03-29-08, 06:24 PM   #3
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Craigslist. Local. $80. I talked him down because it did need some attention.
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Old 03-29-08, 06:32 PM   #4
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I can't give you an engineering answer but I'd ride it like that.
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Old 03-29-08, 06:34 PM   #5
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my opinion

alluminum does have a short fatique life, so a lot depends on how much and how hard the frame was ridden previously. this part of the frame (which is damaged) fatigues from pedal-induce torque, verses road shock or hard landings. I'd say, if you're under 170 lbs and never really push extremely large gears at low cadences, the frame is fine, no matter how much previous use. The rounded edges of the wear-spot are good,--there will be no stress-risers from sharp edges which would eventually start a crack. I think you're fine, but i'd feel really bad and be very surprised if the frame started to crack on you.....good luck!
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Old 03-29-08, 07:19 PM   #6
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My biggest concern would be the potential issues with frame alignment that would have led to the damage.
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Old 03-29-08, 07:54 PM   #7
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The rear wheel wasn't the 700 that it should have been. It was a cheap 27" that I imagine was swapped in place. I've read the rear wheels on the Sirrus in 2001 had a lot of quality issues. I figure the guy ran it either improperly dished, spaced, or both. The frame doesn't look tweaked or anything.
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Old 03-29-08, 09:28 PM   #8
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If your chainstay did in the future decide to crack on you, it wouldn't be catastrophic. The wheel would probably cant over and just start rubbing on the other stay. Thats when you hop off and call home.
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Old 03-30-08, 05:49 AM   #9
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for $80? i'd ride it. if it only lasts 6 mos. it's still worth it.
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Old 03-30-08, 07:00 AM   #10
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If your chainstay did in the future decide to crack on you, it wouldn't be catastrophic. The wheel would probably cant over and just start rubbing on the other stay. Thats when you hop off and call home.
That's my take also. A failure at this location would likely be a nuisance, not a catastrophe.
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Old 03-30-08, 07:26 AM   #11
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The big fear about aluminum is fatigue, from a bend or a dent. Your tire did wear a bit of material away, but it is not a bend. So, it might be marginally weaker than new because there is less material, but in my opinion it is really hardly any weaker than when it was new.

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Old 03-30-08, 07:32 AM   #12
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If the tire was too large, I would expect to see wear on both sides... And if the dish was off, I would expect to see wear on both the seat stay and chain stay.

I am not saying that bad alignment would be fatal, I just think the alignmnt should be checked visually so you know what you're dealing with.

When seated, the wheel should have equal gaps between the seat stays and tire, and equal gaps between the chainstays and tire. The gaps between seat stays and chain stays may be different...

I agree, not fatal, and whether aligned or not I wouldn't trust this frame for high speed technical descents.
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Old 03-30-08, 08:02 AM   #13
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Should be okay, aluminum is pretty thick.

My guess is the wheel got out of alignment (broken spokes maybe, or taco'ed rim) and the tire was rubbing.
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Old 03-30-08, 09:43 AM   #14
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Isn't it way more likely that the wheel was just not mounted square to the frame? Or was not secured properly and shifted. Dish or alignment are certainly possible, but less likely than merely a shifted wheel.

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Old 03-30-08, 12:52 PM   #15
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It is rubbed on the seat and chain stay on the non drive side. It won't be seeing off-road duty so I won't be too concerned with frame failure. Thanks for all the input guys. I think I'm going to go enjoy my new ride.
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Old 03-30-08, 02:25 PM   #16
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How could someone ride a bike with that kind of drag and not fix the problem? I don't even want the drag that a cheap add on generator creates. It had to be scraping like crazy to wear away the metal.
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Old 03-30-08, 02:40 PM   #17
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How could someone ride a bike with that kind of drag and not fix the problem?
Rider kept using the "My brakes are rubbing" excuse & his buddies kept laughing at him when brake clearance looked OK.
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