Largest tire before Mini-Tubbing
02-11-2011, 01:56 PM
#1
Largest tire before Mini-Tubbing I've got a project build for a drag-only car going on right now, and was wondering what the largest slick that could be used on a 15" rim without mini-tubbing would be, and how much more tire you can fit under there by mini-tubbing. Thanks guys.
02-12-2011, 09:39 AM
#7
Even the 30 doesn't really fit right, honestly without having the car look somehwat funny anything bigger then a 28x10.5 you need to do something to get it in the wheel well some. Narrow the axle a little bit to put the tire up inside the wheel well, and once you have it in there now the inner tub needs to go to make room.
I don't know what you are trying to do et or power wise, but there's a good chance that you won't need any more then a 28x10.5 slick anyway, and for a drag radial, a 325/50 will fit, again with some cutting and beating of the inner well, the 295/55 will also fit with the same work. All 3 of those tires have been to bottom 8 and 7 second ET's on cars over the years, so to need more then those.... well it's not normal unless you are building for a class and there's a specific advantage to having them.
I don't know what you are trying to do et or power wise, but there's a good chance that you won't need any more then a 28x10.5 slick anyway, and for a drag radial, a 325/50 will fit, again with some cutting and beating of the inner well, the 295/55 will also fit with the same work. All 3 of those tires have been to bottom 8 and 7 second ET's on cars over the years, so to need more then those.... well it's not normal unless you are building for a class and there's a specific advantage to having them.
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02-12-2011, 01:46 PM
#10
LS1Tech Co-Founder
iTrader: (34)
OP, but cutting the fender opening is okay or not? To fit a 30" tall tire without tubs you are trimming the fenders lips.
I've seen some tight 29.5's but biggest I fit was a 28W.
I've seen some tight 29.5's but biggest I fit was a 28W.
02-12-2011, 05:02 PM
#11
I run a 315/60r15 with no mini tubs
And yes it is very tight
And yes it is very tight
02-12-2011, 05:29 PM
#12
Theres alot of beating that needs done for this, my car has 315/60/16 hoosier DRs on weld prostars and they rubbed too much even after the previous ower trimmed and beat the hell outta the inner fenders. Im finishing up my right side mini tub right now, they are well worth it, beyond fitting bigger tires it saves weight.
02-12-2011, 08:35 PM
#15
firebird have more room, then a camaro. The body line/fender is wider.
you need to roll the fender lip over run a 28-30
if you remove the armrest metal you can hammer the BFH spot really easy.
http://s2.photobucket.com/albums/y11...Picture365.jpg
I cut the extra metal lip off the inner wheel well, after this pic was taken. In that spot above the LCA were you need to BFH. After a cut the lip off I hammers it in about another 3/4 inch. So were I cut the floor metal went down and the wheel well went back. After the floor metal was about 3/4 longer then the place I cut both of them flush as in that pic. I trimmed the extra off and seal welded it, so I now have almost a min tub with the stock wheel wells. I didn't need to do it right now, but was there so made the room. If I cut the bumpstop metal right out I'm sure I could run a 15x10 with 7 BS over the 7.5 I have.
you need to roll the fender lip over run a 28-30
if you remove the armrest metal you can hammer the BFH spot really easy.
http://s2.photobucket.com/albums/y11...Picture365.jpg
I cut the extra metal lip off the inner wheel well, after this pic was taken. In that spot above the LCA were you need to BFH. After a cut the lip off I hammers it in about another 3/4 inch. So were I cut the floor metal went down and the wheel well went back. After the floor metal was about 3/4 longer then the place I cut both of them flush as in that pic. I trimmed the extra off and seal welded it, so I now have almost a min tub with the stock wheel wells. I didn't need to do it right now, but was there so made the room. If I cut the bumpstop metal right out I'm sure I could run a 15x10 with 7 BS over the 7.5 I have.
02-13-2011, 07:31 AM
#16
There is a feature on my car in GMHTP this month with some good pictures of the car from behind. Of course they do not tuck like I would like them to but I work with what I have. I cant afford to buy new rims, have the rearend narrowed nor the time to do the mini tub.
02-14-2011, 08:25 PM
#17
Well my situation is I'm in the middle of a drag car project build, and I want to run 28" x 10" slicks, and I had always thought mini-tubbing was in this cars future, but I was wondering if it was necessary, and if it wasn't then saving the time and money would be nice.
I ordered a narrowed rear 3" on both sides from MWC, its a fabricated 9". I wouldn't think this would have any bearing on whether I had to mini-tub or not since it would really just change the backspacing of the rim I went with.
I ordered a narrowed rear 3" on both sides from MWC, its a fabricated 9". I wouldn't think this would have any bearing on whether I had to mini-tub or not since it would really just change the backspacing of the rim I went with.
02-16-2011, 05:47 PM
#20
thats the setup 4,320 other 4th gens run, so it works I do it without cutting the bumper,fender. Just removed the bumpstop, grind that spot down to 1/8 of the bumpstop bolt holes. And BFH the front area of the inner wheel well. LCA to center the rearend. I rolled the fender lip so I can tuck the tire. firebirds are little wider fender so you shouldn't
Do I search I posted pics of this a few times.
"fitting 28x10.5"
"BFH 28x10.5
"cutting bumper for 28 slicks"
30 slicks you deff. have to trim the bumper a lot, most guys have the metal front fender cut a little too. 30 radials dont grow but you sill have to cut the pastic bumper lip at least in the back.
Do I search I posted pics of this a few times.
"fitting 28x10.5"
"BFH 28x10.5
"cutting bumper for 28 slicks"
30 slicks you deff. have to trim the bumper a lot, most guys have the metal front fender cut a little too. 30 radials dont grow but you sill have to cut the pastic bumper lip at least in the back.