CSOB thwarted again, 3-piece rim tire mounting fail, A6 was no problem, A7 fighting back |
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CSOB thwarted again, 3-piece rim tire mounting fail, A6 was no problem, A7 fighting back |
mskala |
Aug 8 2016, 09:17 AM
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#1
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
So, for my Fuchs centered BBS race wheels, 7.5x16, I finally have the need to put
on the Hoosier A7. (My tires last a long time since I don't do too many events per year). A while back, I got sick of tire places that charge $75 or more to mount up the stuff that they don't sell. I told them if they would sell Hoosier I would buy it there. So when I had the A6, I just took apart the wheels and assembled on the tires. Don't need good balancing for low speeds at autocross so I can do that on a bubble. The A7 in the same 205/45/16 size looks identical in dimensions, but the damn things will not seat the last part of one of the beads. I'm not going above 40psi. I used a rubber mallet for a while, I put one on the car to shake it, then I went up and down the driveway a few times, then a few hundred yards down the street slowing going side to side. No dice. Now I have 2 like this and the other 2 I haven't tried at all. Any special way to make this work or do I have to crawl back to the bastards with the machinery? Thanks |
bretth |
Aug 8 2016, 10:45 AM
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#2
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Senior Member Group: Members Posts: 899 Joined: 23-June 15 From: Central TX Member No.: 18,882 Region Association: Southwest Region |
Harbor Freight sells a manual tire changing stand for $45. Don't know how well it works though.
http://www.harborfreight.com/automotive-mo...nger-62317.html |
mskala |
Aug 8 2016, 11:21 AM
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#3
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
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mskala |
Aug 8 2016, 05:47 PM
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#4
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
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stownsen914 |
Aug 9 2016, 07:55 AM
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#5
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Senior Member Group: Members Posts: 916 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
Silly question perhaps, but I assume you've lubed up the beads well with soap? (or some like hair spray if you have any issues with tires rotating on the rims while driving)
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6freak |
Aug 9 2016, 08:07 AM
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#6
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MR.C Group: Members Posts: 4,740 Joined: 19-March 08 From: Tacoma WA Member No.: 8,829 Region Association: Pacific Northwest |
yep soap and water...and why not go over fourty psi to set the bead? might only take 42 psi to pop hahaha pun intended ..dont be scared (IMG:style_emoticons/default/biggrin.gif)
MikeC |
sixnotfour |
Aug 9 2016, 09:19 AM
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#7
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914 Wizard Group: Members Posts: 10,437 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains |
always use lube...
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mskala |
Aug 9 2016, 09:20 AM
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#8
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
Strangely, on the A6 I did not use any lube at all, with no problems.
Now, I made the mistake of reading a bunch of crap on the internet, so apparently some soaps have a sodium hydroxide which is not good to leave in contact with aluminum. So I went with K-Y. Seems slippery, but once part of the bead gets into the right place, the last part has a bigger hump to get over. It's maybe only 1/8" bigger diameter but won't budge. The tires say right on the sidewall not to exceed 40psi when seating. Also, BBS of course is a spun aluminum rim piece which I'm sure is not as strong as a 1-piece. I don't want to damage anything. Maybe I'll find a good soap and use tons of soap and water. |
Randal |
Aug 9 2016, 01:28 PM
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#9
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Advanced Member Group: Members Posts: 4,446 Joined: 29-May 03 From: Los Altos, CA Member No.: 750 |
Strangely, on the A6 I did not use any lube at all, with no problems. Now, I made the mistake of reading a bunch of crap on the internet, so apparently some soaps have a sodium hydroxide which is not good to leave in contact with aluminum. So I went with K-Y. Seems slippery, but once part of the bead gets into the right place, the last part has a bigger hump to get over. It's maybe only 1/8" bigger diameter but won't budge. The tires say right on the sidewall not to exceed 40psi when seating. Also, BBS of course is a spun aluminum rim piece which I'm sure is not as strong as a 1-piece. I don't want to damage anything. Maybe I'll find a good soap and use tons of soap and water. Clean and polish(*) the inside of the barrrel before putting it together, then as others said, use soapy water on both the barrel and the rim. (*) the smoother the aluminum barrel the better. And if it doesn't seat at 40psi, take the tire back as outlined in the Hoosier race tire guide. From: http://www.tirerack.com/tires/tires.jsp?ti...mp;tireModel=A7 WARNING BEAD / RIM SEATING When seating beads never exceed maximum bead seating pressure as molded in tire sidewall. Never exceed manufacturer’s maximum inflation pressure. Always seat beads with wheel locked to mounting machine or placed in a safety cage. A damaged tire or wheel can fail during bead eating and burst wit h enough force sufficient to cause SERIOUS PERSONAL INJURY OR DEATH. Always use a clip on chuck, an in-line valve with a pressure gauge or adjustable regulator and remote inflation/deflation device. Have enough air hose to stay out of the trajectory. Stand back. If the beads will not seat at the manufacturers maximum bead seating pressure, STOP, deflate tire, return the tire to the place of purchase. |
mskala |
Aug 9 2016, 02:12 PM
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#10
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
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6freak |
Aug 9 2016, 03:30 PM
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#11
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MR.C Group: Members Posts: 4,740 Joined: 19-March 08 From: Tacoma WA Member No.: 8,829 Region Association: Pacific Northwest |
10 4 on the over 40 i had no idea you learn something new evryday
(IMG:style_emoticons/default/smile.gif) |
mskala |
Aug 9 2016, 07:10 PM
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#12
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
Had time to try one tonight. I cleaned and polished to the degree possible,
then used a bunch of palmolive, and it popped on at 30psi. |
6freak |
Aug 10 2016, 07:59 AM
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#13
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MR.C Group: Members Posts: 4,740 Joined: 19-March 08 From: Tacoma WA Member No.: 8,829 Region Association: Pacific Northwest |
Had time to try one tonight. I cleaned and polished to the degree possible, then used a bunch of palmolive, and it popped on at 30psi. (IMG:style_emoticons/default/piratenanner.gif) (IMG:style_emoticons/default/driving.gif) go use um up |
mskala |
Aug 11 2016, 07:54 PM
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#14
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
All 4 are on. I think I figured out the basic problem. I'm using 6" inner
and 1.5" outer. The inner always popped right in, there is only a small hump and it stays aligned during assembly. But the 1.5" outer doesn't have anything after the hump, it takes a 90 degree turn there. So about 1/2 of it seats during assembly and then the other half has a big hill to climb. I needed to clean that part with scotchbrite really well, then smear on the dishwashing liquid to that piece and to the bottom of the tire bead. Then by the time you get to about 30 - 35 psi it slips past. |
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