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#1 |
Registered User
![]() Join Date: Apr 2012
Location: Lehi,Utah
Posts: 1,330
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16.5 wheel hitting rear brake drums
So I had a bright idea to put some 16.5 x 8.25 wheels on one of my Blazers. While I was tightening the rear wheels they did not seem to be tightening down soon enough. I thought maybe they were tight on the center of the axle. Anyway I went for a ride and could hear grinding noises coming from the rear end. I crawled under to investigate and it appears that the outer edge of the drum is in contact with the wheel. This is deforming the drum pushing it into the backing plate. I am just interested if anyone has experienced this before.
Thanks, Paul |
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#2 |
Registered User
Join Date: Dec 2014
Location: Coal City, IL
Posts: 695
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Re: 16.5 wheel hitting rear brake drums
I'm guessing that your new rims have too much back spacing.
__________________
Tony Nicholas @ Midwest Metal Masters 1953 Chevy 3100 392 Hemi w/727 & 9” Ford 1985 Chevy C/10 6.0L 4L80 373 locker |
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#3 |
Registered User
![]() Join Date: Apr 2012
Location: Lehi,Utah
Posts: 1,330
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Re: 16.5 wheel hitting rear brake drums
These wheels have about 4 1/2" of back space. The wheel is hitting the edge of the brake drum. It seems to be more of a problem of the shape of the wheel. Hopefully you be able to see where the wheel was contacting the drum in the attached picture.
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#4 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: 16.5 wheel hitting rear brake drums
never heard of such a thing. I have run 15" wheels on a K/20 with HO52 as well as on Dana 60s and they cleared those larger brakes. They even cleared the front calipers once I took the casting ridge out of the center radius
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#5 | |
Registered User
![]() Join Date: Apr 2012
Location: Lehi,Utah
Posts: 1,330
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Re: 16.5 wheel hitting rear brake drums
Quote:
Thanks for the replies, Paul |
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#6 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: 16.5 wheel hitting rear brake drums
It does seem odd -- I also ran 15s for a few years on my K20 with HO52 and big finned drums, with no interference at all.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#7 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: 16.5 wheel hitting rear brake drums
I know Blazers had the bigger finned drums and there were smaller ones on C/10s. Maybe the drum profile changed when disc brakes came out
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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