Updated Tire Sizes Si

[Survivor]

I've read the sticky for this very topic above. It has fallin a bit short and not logically accurate. I researched a bit because it didn't make sence from my past experience in the field. I came to conclude the following,

Stock tire sizes as recommended by Honda for the Si,

215/45 R17 the tire diameter is 24.6"
215/40 R18 " " " " 24.8"

As suggested by the sticky here

225/40 R18 the tire diameter is 25.1"


It is no wonder some members have experienced tire rubbing and such using 225/40 R18 whereas they are generally almost 1/2 of an inch taller than stock. Also some of you scratch your heads thinking member A is BS ing about a time slip that is quicker than yours. You have several mods and he has none. Never considering you may have missed your setup with your first mod. Your tires are taller, you just geared it for the highway! Not the dragstrip or getting out of corners quicker.

So how about this,

225/35 R18 the tire diameter is 24.2"

I think it is a better choice. This size is not as popular as the 225/40 R18 and generally will cost more per tire. You will likely get pulled over less by 5 o because you speedo is closer to the actual than with the taller tire that makes your speedo read a slower mph. Thats right, your speeding and you didn't even know it. Good discussion to have with a judge if you have a speeding ticking. Blame it on improper tire sizing. GL though! So your speedo will click a few extra with these but it is soo close. Now time to research wheel widths to maintain proper aspect ratio. Someone think they know. Post it.

Heres another final thought,
The difference between 225/40 R18 and 225/35 R18 is almost 1 whole inch in height. I'd say that free ET.





http://http://www.onlineconversion.com/tire_size_conversion.htm

[pgFA]

Good info. And that is why the tire size recommended for HFP 18" and Mugen GP 18" is 215/40/18. Also, Mugen Si come in 215/40/18.

[Survivor]

Originally Posted by pgFA

Good info. And that is why the tire size recommended for HFP 18" and Mugen GP 18" is 215/40/18. Also, Mugen Si come in 215/40/18.

Hope it helped you. I guess if I were from Cali more would agree. Atleast theres one that agrees; thanks. Oh well, glad to be a Canuck.

[Sirbelch]

My 17x8 235/40/17 are 24.4 inches tall and lighter than stock to boot. Thats free ET.

[tite681]

In terms of gas mileage, which tire diameter is better? I am guessing smaller diameter for city driving and bigger diameter for freeway.

[Sirbelch]

Originally Posted by tite681

In terms of gas mileage, which tire diameter is better? I am guessing smaller diameter for city driving and bigger diameter for freeway.

the smallest lightest wheel with give you the best mileage every where.

[Phalanx]

Forgive my ignorance... but what is 'ET' an abbreviation for? Besides "Extra Terrestrial"

[chenslee_cheese]

I'm running 235/40/17's as well. These are just a smidgen smaller in diameter than stock and more than 3/4" wider.

ET = elapsed time.

[TeamBadger]

Originally Posted by chenslee_cheese

I'm running 235/40/17's as well. These are just a smidgen smaller in diameter than stock and more than 3/4" wider.

ET = elapsed time.

On wat size wheel??

[chenslee_cheese]

Originally Posted by TeamBadger

On wat size wheel??

17x8, 45mm offset

[20strong]

That is what I am running (much to my not realizing it) I thought that they were 225/40-18.

[07 Figi Blue Si]

Originally Posted by Survivor

I've read the sticky for this very topic above. It has fallin a bit short and not logically accurate. I researched a bit because it didn't make sence from my past experience in the field. I came to conclude the following,

Stock tire sizes as recommended by Honda for the Si,

215/45 R17 the tire diameter is 24.6"
215/40 R18 " " " " 24.8"

As suggested by the sticky here

225/40 R18 the tire diameter is 25.1"


It is no wonder some members have experienced tire rubbing and such using 225/40 R18 whereas they are generally almost 1/2 of an inch taller than stock. Also some of you scratch your heads thinking member A is BS ing about a time slip that is quicker than yours. You have several mods and he has none. Never considering you may have missed your setup with your first mod. Your tires are taller, you just geared it for the highway! Not the dragstrip or getting out of corners quicker.

So how about this,

225/35 R18 the tire diameter is 24.2"

I think it is a better choice. This size is not as popular as the 225/40 R18 and generally will cost more per tire. You will likely get pulled over less by 5 o because you speedo is closer to the actual than with the taller tire that makes your speedo read a slower mph. Thats right, your speeding and you didn't even know it. Good discussion to have with a judge if you have a speeding ticking. Blame it on improper tire sizing. GL though! So your speedo will click a few extra with these but it is soo close. Now time to research wheel widths to maintain proper aspect ratio. Someone think they know. Post it.

Heres another final thought,
The difference between 225/40 R18 and 225/35 R18 is almost 1 whole inch in height. I'd say that free ET.





http://http://www.onlineconversion.com/tire_size_conversion.htm

But 225 45 R17 works on 17x7. Tire diameter is 25.0 I have this on my FG2 with stock suspension and no rubbing.

235 40 R17 works. Tire diameter is 24.4
245 40 R17 rubs. Tire diameter is 24.7
225 40 R18 rubs. Tire diameter is 25.1. Which is just 0.1" larger than the tires I run at the same tire width. The only difference would be the wider rim 17x8. Could just the rim make the difference?

So its not just diameter, but width, offset, lowered or stock, type of driving (autox, mountain, spirited, freeway) all play a part in determining if it'll fit or not.