69 dart tire size question

putting together a 69 dart and i have a set of 29x14.5 hoosier dot slicks i'm thinking of throwing on as it will be a street legal race car. will be minitubbed to the frame rails with roller wheel openings if needed. gonna use 15x10 slotted mags and narrow the rear end to fit with the offset. super stock springs. just wanna see if anybody has an idea of if they will fit in there and also what is the max size you can usually squeeze in up front on these cars? with a 15 up front as well.

15x10? I would say no. I ran a 71 Scamp that I did the leaf spring relocation in the frame rails with mini tubs and ran 29x 10.5W 15 slicks on 15x8 Pro Stars and that worked good.

With a full 3" spring relocation and mini-tub? 15x10's should be easy.

Since you're narrowing the axle to fit the rims you want, just measure the distance from the frame to the quarter lip. I know on my '71 Dart that's 14.5". You need a 1/2" on each side for tire clearance (roughly), so, on my car that would mean anything with a section width up to 13.5" would fit. There are a few threads regarding max tire width for a mini-tubbed Dart, seems like the general consensus is a 325 or even a 335 will fit depending on the car and tire manufacturer.

Here's a couple threads, there are lots

Widest rim and tire for full mini tub to frame (ignore the Duster with 390's, while its a beautiful car Duster's have wider quarters!)

Post mini tub tire combos? (lots of tire combo's posted here)

For the front, if you're going to keep the 15" rim you should stick with a 15x7". 225/60/15 is about as wide as you're going to go on most Dart's. You might be able to get away with a 235/60/15 depending on your ride height, but you'd need at least 4.25" of backspace on a 15x7" to pull that off.

Those slicks won't fit and they are too wide for those wheels. 72Nblu gave you some great info.

I'll ad to what he wrote and say when you get into that 13.5" section width range you EVERYTHING has to be perfect and it's really pushing the limits. If you buy a tire based on section width, make sure you pay close attention to the measuring wheel size.

Here are 29x12.50x15's on 11.25" wheels. These measure 13.1 on a 10" measuring wheel. They are wider on my. They barely fit. The occasional rub on the leafs, the inner well and on the outside well.

As said above I have mini tube, spring relocation and narrowed rear end and a 29 x 13.5 is really pushing it.

roccodart440 said:

Those slicks won't fit and they are too wide for those wheels. 72Nblu gave you some great info.

I'll ad to what he wrote and say when you get into that 13.5" section width range you EVERYTHING has to be perfect and it's really pushing the limits. If you buy a tire based on section width, make sure you pay close attention to the measuring wheel size.

Here are 29x12.50x15's on 11.25" wheels. These measure 13.1 on a 10" measuring wheel. They are wider on my. They barely fit. The occasional rub on the leafs, the inner well and on the outside well.

View attachment 1715046796

Click to expand...

Good point about the measured wheel width, that's always important to consider because you can squeeze or stretch the section width quite a bit if your rim is narrower or wider than the measured rim.

And, I should have probably been more clear, just because my car would have about 13.5" to work with doesn't mean all of them will either. Got to measure your own car, some may have less, some may have more, and you might not have the exact same measurement on both sides. As the tires get wider and taller the clearance requirements increase too because you get more sidewall movement, and more effect on the tire clearance from putting the body or axle at an angle like with cornering or suspension travel (bumps etc).

And a 1/2" clearance is just a general rule for minimum clearance that I use. It's definitely the minimum to the quarters. And honestly I'm usually dealing with smaller tires than what we're discussing here.

That is a LOT of tire spacecowboy!!!

72bluNblu said:

Good point about the measured wheel width, that's always important to consider because you can squeeze or stretch the section width quite a bit if your rim is narrower or wider than the measured rim.

And, I should have probably been more clear, just because my car would have about 13.5" to work with doesn't mean all of them will either. Got to measure your own car, some may have less, some may have more, and you might not have the exact same measurement on both sides. As the tires get wider and taller the clearance requirements increase too because you get more sidewall movement, and more effect on the tire clearance from putting the body or axle at an angle like with cornering or suspension travel (bumps etc).

And a 1/2" clearance is just a general rule for minimum clearance that I use. It's definitely the minimum to the quarters. And honestly I'm usually dealing with smaller tires than what we're discussing here.

That is a LOT of tire spacecowboy!!!

Click to expand...

Agreed these cars are way different from car to car. Also my tires are on a 10" wide wheel. I have 3/4 " on frame rail and 1/2 " on quarter side , offset is 4 3/4" if memory serves me right.

roccodart440 said:

Those slicks won't fit and they are too wide for those wheels. 72Nblu gave you some great info.

I'll ad to what he wrote and say when you get into that 13.5" section width range you EVERYTHING has to be perfect and it's really pushing the limits. If you buy a tire based on section width, make sure you pay close attention to the measuring wheel size.

Here are 29x12.50x15's on 11.25" wheels. These measure 13.1 on a 10" measuring wheel. They are wider on my. They barely fit. The occasional rub on the leafs, the inner well and on the outside well.

View attachment 1715046796

Click to expand...

they are not a 13.5 tread width. they are advertised as fitting a 10-12 inch wheel

elitesrock2 said:

they are not a 13.5 tread width. they are advertised as fitting a 10-12 inch wheel

Click to expand...

You need to know what the section width of that slick is.

Yes, they will fit a 10-12" wheel. Ideally you want to lean further towards the higher end of that range as far as tire function goes.