What tire size for 7x15" wheels? (Track use only)
Thread Starter
Honda-Tech Member
Joined: Jan 2003
Posts: 1,791
Likes: 0
From: Molde, Norway
What tire size for 7x15" wheels? (Track use only)
As it says I'm gonna be shopping some track tires for my ITR, and have a set of 7x15" wheels i plan to use. What would be the best tire size on these wheels?
I am thinking of getting a set of Bridgestone Potenza RE540 in either 205/50 or 215/50, the 215 ones are actually a bit cheaper. I know these are not available in the US but they are quite popular here in Europe.
I am thinking of getting a set of Bridgestone Potenza RE540 in either 205/50 or 215/50, the 215 ones are actually a bit cheaper. I know these are not available in the US but they are quite popular here in Europe.
Honda-Tech Member
Joined: Oct 2000
Posts: 4,406
Likes: 0
From: Brooklyn, NY
Re: What tire size for 7x15" wheels? (99ITR#3715)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99ITR#3715 »</TD></TR><TR><TD CLASS="quote">Yes they are about 1lbs lighter than the 215's</TD></TR></TABLE>
which is equlivant to around 25lbs of static mass in your car.
which is equlivant to around 25lbs of static mass in your car.
Senior Member
Joined: Oct 2001
Posts: 30,826
Likes: 0
From: RIP Craig Jones
Re: What tire size for 7x15" wheels? (jond)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jond »</TD></TR><TR><TD CLASS="quote">which is equlivant to around 25lbs of static mass in your car.
</TD></TR></TABLE>
1lb of rotational mass = 25 lbs static mass? wtf?
Can you back that up with some hard data?
</TD></TR></TABLE>
1lb of rotational mass = 25 lbs static mass? wtf?
Can you back that up with some hard data?
Trending Topics
Thread Starter
Honda-Tech Member
Joined: Jan 2003
Posts: 1,791
Likes: 0
From: Molde, Norway
Honda-Tech Member
Joined: Oct 2000
Posts: 4,406
Likes: 0
From: Brooklyn, NY
Re: What tire size for 7x15" wheels? (.RJ)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .RJ »</TD></TR><TR><TD CLASS="quote">1lb of rotational mass = 25 lbs static mass? wtf?
Can you back that up with some hard data?</TD></TR></TABLE>
1lb/tire * 4 tires = 4lbs of rotational mass.
The general rule I believe is 1lb of rotation mass = 6lbs of static mass.
Hence 4lbs * 6 = 24lbs
I may be wrong though...
Can you back that up with some hard data?</TD></TR></TABLE>
1lb/tire * 4 tires = 4lbs of rotational mass.
The general rule I believe is 1lb of rotation mass = 6lbs of static mass.
Hence 4lbs * 6 = 24lbs
I may be wrong though...
Senior Member
Joined: Oct 2001
Posts: 30,826
Likes: 0
From: RIP Craig Jones
Re: What tire size for 7x15" wheels? (jond)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jond »</TD></TR><TR><TD CLASS="quote">The general rule I believe is 1lb of rotation mass = 6lbs of static mass.</TD></TR></TABLE>
From where?
Either way, you shouldnt sacrifice grip for marginal improvements in power or weight.
From where?
Either way, you shouldnt sacrifice grip for marginal improvements in power or weight.
Honda-Tech Member
Joined: Jan 2001
Posts: 8,136
Likes: 2
From: kuidaore
Re: What tire size for 7x15" wheels? (.RJ)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .RJ »</TD></TR><TR><TD CLASS="quote">
From where?
Either way, you shouldnt sacrifice grip for marginal improvements in power or weight.</TD></TR></TABLE>
And on that note, 225/45/15's on 15x7" wheels here.
From where?
Either way, you shouldnt sacrifice grip for marginal improvements in power or weight.</TD></TR></TABLE>
And on that note, 225/45/15's on 15x7" wheels here.
Thread Starter
Honda-Tech Member
Joined: Jan 2003
Posts: 1,791
Likes: 0
From: Molde, Norway
Re: What tire size for 7x15" wheels? (.RJ)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .RJ »</TD></TR><TR><TD CLASS="quote">
From where?
Either way, you shouldnt sacrifice grip for marginal improvements in power or weight.</TD></TR></TABLE>
So you think I should go for 215/50 instead of 205's?
From where?
Either way, you shouldnt sacrifice grip for marginal improvements in power or weight.</TD></TR></TABLE>
So you think I should go for 215/50 instead of 205's?
Honda-Tech Member
Joined: Aug 2002
Posts: 6,112
Likes: 0
Re: What tire size for 7x15" wheels? (99ITR#3715)
ehmm.. i woud'nt go any wider than 205's for 15x7..
and for these saying about rotational mass, you will never see a difference.. its all in theory and stays there.. just like lighter flywheel.
and for these saying about rotational mass, you will never see a difference.. its all in theory and stays there.. just like lighter flywheel.
Honda-Tech Member
Joined: Jan 2000
Posts: 9,684
Likes: 1
Re: What tire size for 7x15" wheels? (jond)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jond »</TD></TR><TR><TD CLASS="quote">
1lb/tire * 4 tires = 4lbs of rotational mass.
The general rule I believe is 1lb of rotation mass = 6lbs of static mass.
Hence 4lbs * 6 = 24lbs
I may be wrong though...
</TD></TR></TABLE>
you cant do that.
rotational inertia factors in the radius of the rotation. That being said, the actual radius matters.
now if your assuming everyones going to use a wheel/tiresize that is "oem"
then your comparison might be right.
1lb/tire * 4 tires = 4lbs of rotational mass.
The general rule I believe is 1lb of rotation mass = 6lbs of static mass.
Hence 4lbs * 6 = 24lbs
I may be wrong though...
</TD></TR></TABLE>
you cant do that.
rotational inertia factors in the radius of the rotation. That being said, the actual radius matters.
now if your assuming everyones going to use a wheel/tiresize that is "oem"
then your comparison might be right.
H-T Order of Merit
Joined: Dec 1999
Posts: 96,587
Likes: 38
From: Siege Perilous
Re: What tire size for 7x15" wheels? (99ITR#3715)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99ITR#3715 »</TD></TR><TR><TD CLASS="quote">As it says I'm gonna be shopping some track tires for my ITR, and have a set of 7x15" wheels i plan to use. What would be the best tire size on these wheels?</TD></TR></TABLE>
The most common size on that wheel is 205-50-15, by an overwhelming margin.
Remember that "R" compound tyres are wider than the "205" would normally lead you to believe, however.
What offset are your wheels? If they're in the 35-38 range, you might actually have to think carefully about the fit on the outside, especially, for some reason, the left rear.
215 is also a good choice, and the racers are preferring 225-45-15 R compounds these days, but there can be fender fitment problems with some wheel/tyre combinations. :D
The most common size on that wheel is 205-50-15, by an overwhelming margin.
Remember that "R" compound tyres are wider than the "205" would normally lead you to believe, however.
What offset are your wheels? If they're in the 35-38 range, you might actually have to think carefully about the fit on the outside, especially, for some reason, the left rear.
215 is also a good choice, and the racers are preferring 225-45-15 R compounds these days, but there can be fender fitment problems with some wheel/tyre combinations. :D
Honda-Tech Member
Joined: Mar 2001
Posts: 6,083
Likes: 0
From: Feeling FOBulous
Re: What tire size for 7x15" wheels? (BlueR)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueR »</TD></TR><TR><TD CLASS="quote"> 
</TD></TR></TABLE>
</TD></TR></TABLE>
![](data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50'><circle class='avatar-circle-default' fill='%23e77a4e' cx='25px' cy='25px' r='20px'></circle><text class='avatar-text-default' x='49%' y='53%' fill='white' text-anchor='middle' alignment-baseline='middle'>"</text></svg>)
B*a*n*n*e*d
Joined: Aug 2003
Posts: 1,949
Likes: 0
From: GraffAngeles..., CMA, U.S.A
Re: (^jefs0nq)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ^jefs0nq »</TD></TR><TR><TD CLASS="quote">I read that name 5-6 times and I still.. don't.. believe..</TD></TR></TABLE>i agree..... WTF Hmmm ghost or LiAR?.. haha 