What the 15" equivalent to the 235/85/16?

[rugitis]

Longtime lurker-first time poster. [Quick background] Wife and I ae both Medics and back in school (she's in a PA program, and I'm in nursing) so the next three years will obviously be tight. The wife doesn't agree with modifing cars, especialy now, but I can upgade when things break. Tires have about 7,500 mies left beore I need replacements. So I may be able to swing upgraded tires over stock. Since I'm not supposed to modify per se OEM wheels most stay.

So my to my question: Is their an equivalent to the 235/85/16 but in a 15" diameter? After readig the threads about the size I'm sold but cannot upgrade to 16s.

The truck in question is an '03 Mazda B2300, 5 speed, extended cab, 4x2. Stock at the moment.

Just trying to plan my next move.

Thanks for an insight.

 

[cyclic]

Biggest part would even being fitting anything close to those tires on that truck. Without some lift you can forget it. Those tires are just shy of 32" tall.

 

[tarditi]

Can use this tool too - http://tire-size-conversion.com/tire-size-calculator/

 

[the_dealer]

32x9.50

 

[crick]

So my to my question: Is their an equivalent to the 235/85/16 but in a 15" diameter?

A 235/85/16 tire is 31.6 inches tall. 235mm * 85% = Sidewalls that are 199.75mm tall. Which converts into 15.7 inches. 15.73+15.73+16 (for the wheel) equals 31.6 inches (plus or minus some rounding).

If I am understanding you question correctly, and you want the height and width of the tire to stay fixed while you adjust the opening for the wheel then the aspect ratio need to change (which is the 85 of the 235/85/16).

235/85/15 would be 30.72 inches tall
235/90/15 would be 31.65 inches tall
235/95/15 would be 32.58 inches tall

And don't forget to think about re-calibrating your speedometer if you are able to shoehorn those beasts into your b2300.

 

[1stDeuce]

The short answer is that there's really NOT an equivalent 15" tire anymore. You can do 31x9.50's in a bias Swamper I think, or 30x9.50 in lots of modern tires, but 32x9.50R15's don't exist as far as I know, and bumping up to a 33x10.50R15 would require a LOT of lift, as pointed out above.

Chris

 

[Scott Brady]

You can still find 33x10.50s R15s from some manufacturers. That would be the closest available size.

 

[the_dealer]

There's some 32x10.50's out there, and swamper has a 32x9.50

 

[tommudd]

Bottom line, is going to that size tire worth it in a 2 wheel drive when figuring in the amount of lift needed plus regearing it as well

 

[Martinjmpr]

You can still find 33x10.50s R15s from some manufacturers. That would be the closest available size.

33 x 10.5's on a 2.3 l 4 cyl? That thing would be as slow as a turtle.

To the OP: What is it you're trying to achieve? There's a limit to what you can do with an extended cab 2wd with a 4 cyl, have you reached that limit with your stock tires?

I have basically the same truck but in regular cab configuration (my DD, a 96 Mazda B2300) and the power is OK but not great, (but then, I'm not carrying an extra couple hundred pounds of cab and chassis that your extended cab has, either.)

What are your current tires? I think my '99 Extra Cab Ranger (same truck as your B2300 but mine had the 3.0 V6) came from the factory with 225/70/15's (about 27" diameter) and I upgraded to 235/75/15 (about 29") and they worked well for me. I'd probably be leery of going with anything bigger than a 30" tire given the marginal power of your engine.

 

[the_dealer]

My old 00 2.5L 5 sp(2wd) ranger fit a 31x10.50 with just a 2" coil lift from canuckmotorsports.com

The power loss wasn't too bad on stock rims, but I'd try to go aluminum if possible. I had no rubbing issues on or off road. Check out therangerstation.com for alot of good info for your rig. One of the best RBV forums out there