18" Tires

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nastety92

New member
Is anyone running a set of 275/45/18" tires? I have a new set of 18" wheels and have been looking at new tires and new tires sizes.

Nick
 
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simpleman01

Member
Re: 18" Tires

I'm running 275/40/18s all around. You might want to reconsider the 275/45s. I went to Tire Rack's website and got the following measurements:

245/50/16s (stock syty size) measure 25.6" tall and run 811 revolutions per mile
275/45/18s you're interested in are 27.7" tall and run 755 rpm
275/40/18s I have are 26.6" tall and run 784 rpm, which accounts for my 4% speedo discrepancy
275/35/18s would be my recommendation because they're 25.6" tall and 808 rpm - same as factory!

Not sure what look you're going for, but the 275/45s will make your truck look like it has a lift kit- it'll sit 1" higher than with factory tires. My 275/40s look good and fill out the wheel wells, but my truck sits too high for my taste. If you're planning to race your truck, most folks would suggest going down to a smaller rim - low profile 18s don't hook too well. Hope this helps...
 
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nastety92

New member
Re: 18" Tires

I'm looking for a 28" tall tire. I have 18" rims now and are keeping them. I plan on running larger Corvette brakes soon and need teh 18's. I'm looking to see if anyone is running this size and it it fits the front wheel wells without hitting while turning?

Thanks for the input,
Nick
 
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s_blazin

Donating Member
Re: 18" Tires

i myself was looking into using some 18's, thank you for that info, i think i'll reconsider going to a smaller wheel.

simpleman01 said:
I'm running 275/40/18s all around. You might want to reconsider the 275/45s. I went to Tire Rack's website and got the following measurements:

245/50/16s (stock syty size) measure 25.6" tall and run 811 revolutions per mile
275/45/18s you're interested in are 27.7" tall and run 755 rpm
275/40/18s I have are 26.6" tall and run 784 rpm, which accounts for my 4% speedo discrepancy
275/35/18s would be my recommendation because they're 25.6" tall and 808 rpm - same as factory!

Not sure what look you're going for, but the 275/45s will make your truck look like it has a lift kit- it'll sit 1" higher than with factory tires. My 275/40s look good and fill out the wheel wells, but my truck sits too high for my taste. If you're planning to race your truck, most folks would suggest going down to a smaller rim - low profile 18s don't hook too well. Hope this helps...
Click to expand...
 
4C FED

4C FED

Absolutum Dominium
Re: 18" Tires

J-bird said:
What do you think of those tires??? I was originally going for those, but could not find any in stock for some reason. I ended up getting sumutomos(however you spell that) and I'm happy, but think I'll try those next time.

Thanks,
Click to expand...
Truck is sitting still (like most). Working on all of the details to get it running. I have zero miles on these tires.
 
J-bird

J-bird

Member
Re: 18" Tires

yea, thats the great thing about sy/tys they never seem to wear out a set of tires!! my tires haven't been on the ground in 8 months!
 
AutoVation

AutoVation

Member
Re: 18" Tires

The General UHP's are definitely good tires for the money. Much better than the Sumitomo's. Not to the level of a PS2 or a Eagle GSD3 but they are usually under half the price.
 
Richard Le

Richard Le

New member
Re: 18" Tires

NASTETy92 said:
I'm looking for a 28" tall tire. I have 18" rims now and are keeping them. I plan on running larger Corvette brakes soon and need teh 18's. I'm looking to see if anyone is running this size and it it fits the front wheel wells without hitting while turning?
Click to expand...
Running 28" tall tires will definitely increase the chance of rubbing, mess up speedometer/odometer reading, and slow down the truck. Just because you run 18" rims doesn't mean you can't run tires with the correct diameter.
 
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nastety92

New member
Re: 18" Tires

Richard Le said:
Running 28" tall tires will definitely increase the chance of rubbing, mess up speedometer/odometer reading, and slow down the truck. Just because you run 18" rims doesn't mean you can't run tires with the correct diameter.
Click to expand...

See I understand it throwing off the spedo and odometer, that I'm not to concerned of. But it slowing down the truck, I thought it would do the opposite. I was thinking a taller tire for drag racing would be good for me. Maybe I'm wrong.
Can you explain a little more?

Thanks for the help and the comments.
Nick
 
Richard Le

Richard Le

New member
Re: 18" Tires

NASTETy92 said:
But it slowing down the truck, I thought it would do the opposite. I was thinking a taller tire for drag racing would be good for me.
Click to expand...
Running on larger diameter tires is like running on a larger chainring on a bicycle. You will lose torque and acceleration. Also, larger dia tires have more mass, which take more energy to spin. For larger dia tires to give you benefits, you would need to modity your gear ratios.
 
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raman117

Member
Re: 18" Tires

I spent a lot of time looking at different tire sizes for my 18's. I ended up going with 275/40/18 all the way around, 275/45/18's are hard to find. Admittedly, the front could be lowered a bit (I lowered the back with 1" blocks and a 3/8" setback plate).

vUG24.png
 
Richard Le

Richard Le

New member
Re: 18" Tires

raman117 said:
I think my speedo is off by 3 or 4 mph, is that what you mean when you say they are "too tall"?
Click to expand...
Yes, your tires are a little more than an inch larger in diameter than the stock tires. The difference is clearly visible in the picture you posted (they look too big). Try plugging your tire info into the tire calculator given above.
 
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