Wrong tool for the job?
Moderator: Andy Terry
Wrong tool for the job?
A little problem i had on my commute to work last week.
For winter duty, i have converted my original steel steed into a single speed so not to worry too much about maintenance. Keeping cost down i have used the existing chainwheel and just removed the inner ring, but it appears the additional forces (?) endured after removing the derrailleur was just too much. Chain line was good and was not tight. I have been riding it for about a month before this happened.
- GrahamGamblin
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- John Sanderson
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Good question Paul, i really dont know is that a known cause for this type of failure?paul wrote:is that a 1/18 chain on a 3/32 chainring?
My dads engineering knowledge produced exactly the same statement, Dave.David Cole wrote:I'm amazed, I didn't realise that the inner ring was so important in maintaining the strength of the chainset.
Hope you were'nt hurt
Fortunately, i wasnt going for it at the time, just pulling off from an inclined standing start. Consider myself lucky to have only caught my ankle and not endangered the crown jewels
In the past, I've had bikes with a single ring on a double spider and never had a problem. I had my TT bike set up like that for years; in my 20s I also rode fixed on a bike with one ring on a double spider; and for the last 5+ years I've had that arrangement on my turbo bike. No issues with any of them.
You do usually need shorter bolts though. Is it possible that you used the double bolts and there was consequently a bit of play, leading to fatigue? Otherwise, maybe it was just a defective ring, and would have happened regardless of the set-up.
You do usually need shorter bolts though. Is it possible that you used the double bolts and there was consequently a bit of play, leading to fatigue? Otherwise, maybe it was just a defective ring, and would have happened regardless of the set-up.
I had no choice but to install shorter bolts. The chainset was sourced second hand and was used in its original double set up for approx 6 months before being modified. Not knowing its full history does make me wonder of any previous damage, wear or possible defect.George wrote:You do usually need shorter bolts though. Is it possible that you used the double bolts and there was consequently a bit of play, leading to fatigue? Otherwise, maybe it was just a defective ring, and would have happened regardless of the set-up.
Hearing that you got it second hand does immediately make me wonder about the possibility of it having previously been weakened, e.g. in a fall. I don't think you should have any qualms about creating a similar set-up again with new components.Mattoid wrote:The chainset was sourced second hand and was used in its original double set up for approx 6 months before being modified. Not knowing its full history does make me wonder of any previous damage, wear or possible defect.
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Dave, Phil isn't sure whether his chain is 1/8 or 3/32, but my guess is that it's 3/32, because it was almost certainly 3/32 before he went single-speed, and I expect he'd know if he'd gone out and bought a 1/8 chain.David Farley wrote:Having looked at the photo i would agree with George in that there may have been some damage when you bought the chainset. So you should have no problem just replacing the ring. However, one thing that i would not be too keen to do, is using a pinned and ramped chainring with a 1/8" chain
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that is a very worn chainring. Classic sharks teeth
Cult Racing...better than Rock Racing
www.cultracing.com
www.cultracing.com
- John Sanderson
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