Tire size for Rally rims

[Blue Heeler]

Well guys time to lower the Blue Heeler. Just bought some new 15x8 rally
need to know what tires you guys could recommend on a 4 inch lowering kit.
thank. Steve

[Rich 5150 69]

275/60r 15 , is about all you can get under it without any more mods, might be a little tight on the front, fender might come down on the wheel with a four inch drop.

[protrash64]

I'd consider the rear end ratio if you're planning on a lot of driving. A taller tire mite help a bit. On my bagged 'burb I ran 295/50/15's and 255/60/15's. With the '66 LB I went with 235/70/15's all around.

[Rich 5150 69]

Originally Posted by protrash64

I'd consider the rear end ratio if you're planning on a lot of driving. A taller tire mite help a bit. On my bagged 'burb I ran 295/50/15's and 255/60/15's. With the '66 LB I went with 235/70/15's all around.

Good point protrash, I`m running 373, just buzzing the motor to death..!

[protrash64]

Originally Posted by Rich 5150 69

Good point protrash, I`m running 373, just buzzing the motor to death..!

Are you sure it's 373?? I thought a 275/60/15 was at least 28'' tall; I considered that size before deciding on the 70's series and narrower tires.

[Rich 5150 69]

Yes I`m pretty sure it is, going by the numbers that were on the housing some many years ago, I`m into thrd gear (turbo 350 ) standard 2 lane intersection before I even clear it...

[paul63c10]

Originally Posted by protrash64

I'd consider the rear end ratio if you're planning on a lot of driving. A taller tire mite help a bit. On my bagged 'burb I ran 295/50/15's and 255/60/15's. With the '66 LB I went with 235/70/15's all around.

Hey protrash, just wondering how this would help?

[62 Longbed]

Om my 62 I'm running 15x8's with 305/50R/15's on the rear , 235/60R/15's on the front ... Gonna go to the 275/60R/15's on the rear after these tires wear out ... Good Luck with your choice ....

[rustyrodknocker]

275 50 15 look like a custom centering job on the rallies. I would not mind going a 1/2 " narrower. but if you change any aspect on these metric tires everything is changed. I do not understand how it is better than dimension tall x dimension wide x rim diameter. thats like everything there is to know about tire size in a few simple numbers. or we can resort to the algebra [widthXaspectx2] /2550+rim diameter. for the height and w/25.50 for the width. for those that prefer the hard way. stupid. I found an online calculator a few years ago that would give you the rpm and effective gear ratio with a given size tire. my 275/60/15 with 3.50 came out to the equevalent of 4.10 with stock tire diameter. not terrible but not 75mph either. especially with flowmasters. those had to go.

[Blue Heeler]

Originally Posted by 62 Longbed

Om my 62 I'm running 15x8's with 305/50R/15's on the rear , 235/60R/15's on the front ... Gonna go to the 275/60R/15's on the rear after these tires wear out ... Good Luck with your choice ....

Nice truck!!! thanks for the pictures. i guess after a few beers i will choose
a tire that fit under there, it's kinda tuff trying to deside.

[protrash64]

Originally Posted by paul63c10

Hey protrash, just wondering how this would help?

A taller tire lowers the gear ratio just like changing the ring and pinion; at least in relation to whatever tire you start with!! Blue Heeler didn't mention the rear ratio so I thought I would mention tire size as something else to figure in when deciding.
All of these trucks are notoriously low geared for highway driving.

[Blue Heeler]

Originally Posted by protrash64

A taller tire lowers the gear ratio just like changing the ring and pinion; at least in relation to whatever tire you start with!! Blue Heeler didn't mention the rear ratio so I thought I would mention tire size as something else to figure in when deciding.
All of these trucks are notoriously low geared for highway driving.

Sorry bout that, the Blue heeler special has the wonderful 4'11 in the rear.
oh i'm just gonna shove a 700r in that money pit. I really thank you guys for all the help. got the rear lights working and drove it all day, then took it to the gas station to put some fuel in it and someone pointed out that i was leaking gas. oh crap another fix. hose came out of fill tube and poured gas inside the cab about a gallon. then drove it home and the radiator started leaking. oh well i guess that how you find the problems. I still love driving that
truck with my dog "Bo" i get the hot rodders checking out the truck.

[Blue Heeler]

Originally Posted by Rich 5150 69

275/60r 15 , is about all you can get under it without any more mods, might be a little tight on the front, fender might come down on the wheel with a four inch drop.

Which lowering kit are you running? and are those 15x8 on there? the kit i'm looking at is 4"drop in rear x 3"drop in front does that make sense.

[1adam12]

Im running 245 60 r 15 with 15x8 ralleys 4inches in front and 5 inches so far in rear no problems so far

[Rich 5150 69]

Originally Posted by Blue Heeler

Which lowering kit are you running? and are those 15x8 on there? the kit i'm looking at is 4"drop in rear x 3"drop in front does that make sense.

3/5 drop, 8x15 rims, 275/60 r 15 all four corners.

[Blue Heeler]

Originally Posted by Rich 5150 69

275/60r 15 , is about all you can get under it without any more mods, might be a little tight on the front, fender might come down on the wheel with a four inch drop.

Thanks for the input so maybe a 15x7 up front?

[Rich 5150 69]

Are you running power steering,? If your not going any lower than mine 15x8 is fine, lower and I would step down to a 7, only because of the interferance issue while turning into a steep driveway for instance.

[Blue Heeler]

Originally Posted by Rich 5150 69

Are you running power steering,? If your not going any lower than mine 15x8 is fine, lower and I would step down to a 7, only because of the interferance issue while turning into a steep driveway for instance.

Yup i'm gonna run power steering just ordered the bracket and got the power
steering pump and gearbox just need to get the hoses. Thanks for the help!!!

[astrochimp]

Originally Posted by Blue Heeler

Thanks for the input so maybe a 15x7 up front?

From what I have read here, the disk brake kits move the wheels out, so clearance would be tighter if your running disk too.

David

[jchav62]

The '65 has a 2/4 drop. Running 15x7's in the front with 245/60's and 15x8's in the rear with 275/60's.

[Blue Heeler]

Originally Posted by jchav62

The '65 has a 2/4 drop. Running 15x7's in the front with 245/60's and 15x8's in the rear with 275/60's.

Oh chit, thats the look i'm trying to get. thanks everyone. its a mind
boggler trying to figure out how to do this with out buying a bunch of stuff
that i'm gonna regret purchasing. thanks and thank:{

[Jonboy]

I have 255/70's on an 8" rally on my '74. It helps fill the fender well. Mine is a little lower though.

[kieth]

I run the same gears but with a 700r4 25% reduction in rpms look at making the 700r4 your next mod.....Kieth

[65Gregg]

265/70/15 on 15x8 rallye-rear
255/70/15 on 15x7 rallye-front
I have to watch sharp turns and driveways, the fronts rub, 4/5 drop.

[Rich 5150 69]

Originally Posted by kieth

I run the same gears but with a 700r4 25% reduction in rpms look at making the 700r4 your next mod.....Kieth

That was the plan in `93 when I first did the make over, well just never got around to it always too many projects in the fire..