Tire size to run

[03BlkZ]

As I am nearing the end of my resto project on my 70 C10 I am trying to decide on a tire size. My truck is lowered with 2.5 inch drop spindles in front and 4 inch drop springs in the rear. I will be running the 6 lug 15x8 rally wheels. I see people say they are running 275/60/15 but wouldn't that be too low profile. Maybe not but I need recommendations. The wheels are being refinished as we speak and as soon as they are done I'm getting tires. Thanks!

[Grumpy old man]

I wanted a 29" tire so I ended up with the BF Goodrich T/As 255 x 70 x 15s on 8" rallys. I plan on driving the wheels off this truck when it's done and I'm not about to carry around a spare and jack in a new wood bed with a rear tank , With AAA premium towing service and the readily available tire brand and size made these a good choice for me . The most it will ever carry again will be a beach chair and a cooler .

I like the look of the 20's and fat tires but I don't like trying to find them on a Saturday let alone replace a custom wheel and tire for $500 ++ out here in the country .

[cj847]

I have been having the same debate with myself. Here are the tire sizes available in 15". In my case I am going with the largest tire diameter I can get due to 3.73 gears and a TH350 transmission. 265/75/15 which is basically a 30" tire. The only problem is there are limited 30-31" tires that are not mud grips or off road tread. And I want it to look like a slightly lowered street truck.

It really depends on what you are trying to do. I would first consider your drivetrain and figure out the diameter first. Then check that that style of tire is available.

https://www.tirerack.com/tires/sizes...sp?diameter=15

[CG]

Here is a 15 inch only tire thread I started awhile back. Lots of good info there. There is also a link to another older yet thread in there.

http://67-72chevytrucks.com/vboard/s...d.php?t=703601

[03BlkZ]

Originally Posted by CG

Here is a 15 inch only tire thread I started awhile back. Lots of good info there. There is also a link to another older yet thread in there.

http://67-72chevytrucks.com/vboard/s...d.php?t=703601

Thank you

[Already Gone]

Originally Posted by Grumpy old man

I wanted a 29" tire so I ended up with the BF Goodrich T/As 255 x 70 x 15s on 8" rallys. I plan on driving the wheels off this truck when it's done and I'm not about to carry around a spare and jack in a new wood bed with a rear tank , With AAA premium towing service and the readily available tire brand and size made these a good choice for me . The most it will ever carry again will be a beach chair and a cooler .

I like the look of the 20's and fat tires but I don't like trying to find them on a Saturday let alone replace a custom wheel and tire for $500 ++ out here in the country .

[67C10Step]

03,
Here is my truck with the exact same drop and exact same wheels you mentioned. I just got tires on it two weeks ago. These are 255/70-15. If I'd have gone another inch in drop all the way around the 60 series might be OK.

I have a fifth rally wheel that I have primed and plan on painting solid black to use as a spare.

[03BlkZ]

Originally Posted by 67C10Step

03,
Here is my truck with the exact same drop and exact same wheels you mentioned. I just got tires on it two weeks ago. These are 255/70-15. If I'd have gone another inch in drop all the way around the 60 series might be OK.

I have a fifth rally wheel that I have primed and plan on painting solid black to use as a spare.

That was exactly what I was looking for. Looks great so 255/70 will probably be the route I go. Here is my truck currently. Almost back on the road.

[67C10Step]

03,
Very nice looking truck. Set of rallys with some nice tires will make that ride look even better. I see you have inner fenders out of yours as well. Did you have to replace the passengers side? If so, did you go repop? I have to find a good inner for the passenger side and have not made up my mind which way to go yet.

[Grumpy old man]

Originally Posted by 67C10Step

03,
Very nice looking truck. Set of rallys with some nice tires will make that ride look even better. I see you have inner fenders out of yours as well. Did you have to replace the passengers side? If so, did you go repop? I have to find a good inner for the passenger side and have not made up my mind which way to go yet.

Goodmark inner fenders are $77.99 at Summit + shipping

https://www.summitracing.com/parts/gmk-4143-350-67l

https://www.summitracing.com/parts/gmk-4143-350-67r

auto metal direct $78.99 + https://www.summitracing.com/parts/amd-250-4067-r

[03BlkZ]

Originally Posted by 67C10Step

03,
Very nice looking truck. Set of rallys with some nice tires will make that ride look even better. I see you have inner fenders out of yours as well. Did you have to replace the passengers side? If so, did you go repop? I have to find a good inner for the passenger side and have not made up my mind which way to go yet.

Yes I did have to replace my passenger side as well as the radiator support. I got my parts from southwest classics in Arlington tx. Every test fit perfectly. I will be installing the inner fenders this Friday probably now that I can fully install the fenders. I was on hold for body side trim.

[hayhauler71]

Same drop as yours 285-70-15 on rear, 255-70-15 on front

[72afr]

Originally Posted by hayhauler71

Same drop as yours 285-70-15 on rear, 255-70-15 on front

Are those really 70 series?

[hayhauler71]

Originally Posted by 72afr

Are those really 70 series?

Yes they are from coker tire Silvertown blackwalls


https://www.cokertire.com/tires/285-...blackwall.html

[rsgt]

I am going to buy the size this truck has. I will get the cooper cobra 255 70 15 for the front and get cooper evolution ht 265 75 15 for the rear.

[03BlkZ]

I'm going to got 255/70. I'm not interested in doing a stagger. I already have to deal with that with my corvette. 335's in the rear and 285' up front.

[rechinca]

I am running the 6.5” van Rally wheels up front with 225/70-15 and 8” Rally’s in the rear with 275/60-15. I went with the Cooper Cobras. I have CPP modular drop spindles ( 2 or 2 1/2” depending what source you believe) with 1” drop springs, and waiting on my 5” drop coils from GMCPauls to come in.

[03BlkZ]

Originally Posted by rechinca

I am running the 6.5” van Rally wheels up front with 225/70-15 and 8” Rally’s in the rear with 275/60-15. I went with the Cooper Cobras. I have CPP modular drop spindles ( 2 or 2 1/2” depending what source you believe) with 1” drop springs, and waiting on my 5” drop coils from GMCPauls to come in.

I'm running the 2.5 inch cpp drops with stock springs and 4 inch lowering coil springs in the rear but I can not remember the brand. Right now my truck is still sitting a little higher in the front but I still don't have the bumper, grill, radiator inner fenders and hood on. Hopefully it levels out but I may have to buy 1 inch lowering springs for the front.

[rechinca]

I hate to post it because it looks like a cat in heat right now, but this is before I get back and can put the 5” springs in.

[67C10Step]

Originally Posted by 03BlkZ

I'm running the 2.5 inch cpp drops with stock springs and 4 inch lowering coil springs in the rear but I can not remember the brand. Right now my truck is still sitting a little higher in the front but I still don't have the bumper, grill, radiator inner fenders and hood on. Hopefully it levels out but I may have to buy 1 inch lowering springs for the front.

You and I were working concurrently on exactly the same build. I used Mcgaughy 4" drop progressive springs in the rear and new stock height Moog in the front with the CPP spindles. I've noticed mine is settling a bit and guess when I drive it the front may settle even a bit more.

[RustyBucket]

275/60/15 T/A's all the way around. NO RUBBIN'.
2.5" spindles w/1 coil cut on the front. 4" springs, w/a 1" block, adj. track bar, shock relocate kit on the rear.

[03BlkZ]

Originally Posted by 67C10Step

You and I were working concurrently on exactly the same build. I used Mcgauhy 4" drop progressive springs in the rear and new stock height Moog in the front with the CPP spindles. I've noticed mine is settling a bit and guess when I drive it the front may settle even a bit more.

Exactly what I hope. I hope once it aligned and able to drive it will settle. Now that you mention McGauhy that is the brand I also used.