ndp

02-24-2004, 07:01 PM

Well, having cruised the archives for a week I feel the need to open yet another discussion on tires.

I want to upgrade the tires on my E. The stock ones bite: They are noisy and have lousy traction. I have been looking at a number of options but I keep getting hung up on the size. There are, as many of you are painfully aware, very few tire options in the stock size. However, changing tire sizes presents a problem with changing tire diameter. Once you depart from the stock tire size it’s virtually impossible to get the exact same diameter.

With the AWD system in the E the dealer (and Honda customer support) made it clear that all four tires be the exact same size and have identical tread patterns. No problem. But, then there is the spare. The spare isn’t even the same size as the stock tires.

Consider:

The stock tires are 215/70R16 which, in theory, are 27.85 inches in diameter and turn 724 revolutions per mile.

The spare tire is a 145/90R16 which, in theory, is 26.28 inches in diameter and turns 768 revolutions per mile. That’s 1.57 inches smaller than the stock tires! I measured this difference my self and that number seems pretty close to accurate (although I didn’t do a rolling circumference measurement test)

My problem: I want to upgrade to 225/70R16’s or even to 235/60/R17’s these add .5 and .25 inches to the tire diameter respectively.

What happens if/when I get a flat? According to Honda (and the dealer) the spare should cause the AWD to activate and, assuming I am on pavement, cause the driveline to self destruct in short order.

But is that actually true? The stock arrangement already has a significant difference in the size of the main tires and the spare. Will the extra half-inch really matter???

To add to the confusion, different tire manufacturers claim different diameters for tires of the same “size”

For example: A 215/70R16 should be 27.8 inches, but Yokohama claims their Geolander H/T-S G051 in that size is actual 28 inches… So will that cause problems?

Has anyone had experience with upgraded (larger) wheels/tires and running the spare to get home? On an AWD model?

I want to upgrade the tires on my E. The stock ones bite: They are noisy and have lousy traction. I have been looking at a number of options but I keep getting hung up on the size. There are, as many of you are painfully aware, very few tire options in the stock size. However, changing tire sizes presents a problem with changing tire diameter. Once you depart from the stock tire size it’s virtually impossible to get the exact same diameter.

With the AWD system in the E the dealer (and Honda customer support) made it clear that all four tires be the exact same size and have identical tread patterns. No problem. But, then there is the spare. The spare isn’t even the same size as the stock tires.

Consider:

The stock tires are 215/70R16 which, in theory, are 27.85 inches in diameter and turn 724 revolutions per mile.

The spare tire is a 145/90R16 which, in theory, is 26.28 inches in diameter and turns 768 revolutions per mile. That’s 1.57 inches smaller than the stock tires! I measured this difference my self and that number seems pretty close to accurate (although I didn’t do a rolling circumference measurement test)

My problem: I want to upgrade to 225/70R16’s or even to 235/60/R17’s these add .5 and .25 inches to the tire diameter respectively.

What happens if/when I get a flat? According to Honda (and the dealer) the spare should cause the AWD to activate and, assuming I am on pavement, cause the driveline to self destruct in short order.

But is that actually true? The stock arrangement already has a significant difference in the size of the main tires and the spare. Will the extra half-inch really matter???

To add to the confusion, different tire manufacturers claim different diameters for tires of the same “size”

For example: A 215/70R16 should be 27.8 inches, but Yokohama claims their Geolander H/T-S G051 in that size is actual 28 inches… So will that cause problems?

Has anyone had experience with upgraded (larger) wheels/tires and running the spare to get home? On an AWD model?