Bent rim - Techniques?
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07-01-20, 08:35 PM
#27
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Assuming the rim joint is not in the affected area...
I use an English wood vise.
1. Two 1/4" inch thick and 1" inch wide vertical strips of wood on the inside - spread out.
2. A 1 x 2 x 3 block with a slightly curved press point placed on the clamping side of the vise.
3. I assemble inner blocks, rim and press block in the vise.
4. The vice itself acts as a press.
5. I stop when the rim is 1/8" past it's original line.
I use this method for tacos....and also for flat spots on box profile rims.
=8-)
I use an English wood vise.
1. Two 1/4" inch thick and 1" inch wide vertical strips of wood on the inside - spread out.
2. A 1 x 2 x 3 block with a slightly curved press point placed on the clamping side of the vise.
3. I assemble inner blocks, rim and press block in the vise.
4. The vice itself acts as a press.
5. I stop when the rim is 1/8" past it's original line.
I use this method for tacos....and also for flat spots on box profile rims.
=8-)
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
07-01-20, 08:42 PM
#28
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I got up this morning all set to tackle my bent rim and then remembered the old rim I took off last year and thought, "why not just swap the cogs?" A long story short, free wheels and free hubs are not the same species. I ended up sacrificing my taller gearing and got the bike road worthy again with the old rim and shorter gearing. I'll get back to that bent rim another day, the wind in my face was calling.
07-05-20, 08:53 PM
#29
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I've made another video since the one several years ago:
Then I made another video giving it an off-road test to see how well it would hold up for a "trashed wheel"
Then I made another video giving it an off-road test to see how well it would hold up for a "trashed wheel"
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07-08-20, 06:13 PM
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My internet is really slow today. Keeps kicking me off. Anyway, I tackled my tacoed wheel and got it reasonably ironed out, but the cogs looked wobbly when I got it all back together. Something in there got bent too. I didn't realize how badly I mangled this thing. I took it for a test run and the bearings immediately came out of adjustment and got sloppier with each mile I rode. Got home and discovered the QR axle or housing or whatever the QR rod slides thru was also bent. So I removed the tire and tube and put it on another rim and put the bike back together with an old rim. Tuned it up and went on a 20+ mile test ride. Everything works good and it was a pleasure to ride. Got home and after pulling the QR rod out of the mangled rim for my parts bin, I threw all the rest in the dumpster. Good riddance. It sure didn't take much to cause so much damage. One blip of inattention. Bike doesn't have the overdrive gear that I liked with this setup, but it's still a joy to ride 
07-09-20, 12:33 PM
#31
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I've straightened out a tackoed rim in the field by pumping up the tire hard and then holding the wheel in front of me with my hands on either side of the wheel. I lift the wheel until it's horizontal and then give it a hard rap against a flat rock. That springs the rim back. I repeat doing that until the rim is very nearly true again.
Cheers
Cheers
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07-09-20, 02:55 PM
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I've straightened out a tackoed rim in the field by pumping up the tire hard and then holding the wheel in front of me with my hands on either side of the wheel. I lift the wheel until it's horizontal and then give it a hard rap against a flat rock. That springs the rim back. I repeat doing that until the rim is very nearly true again.
Cheers
Cheers
07-09-20, 03:31 PM
#33
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07-09-20, 06:24 PM
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07-09-20, 06:34 PM
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Pretty funny when you put it that way. Thanks.
I should perhaps clarify too that its the hard inflated TIRE that hits the flat stone and not the rim.
People who have tackoed a rim and I've straightened like that are surprised at how straight that technique can get a wheel. I practiced with an old steel whee;l to learn how to do it.
Cheers
