Go Back  RX7Club.com - Mazda RX7 Forum > Generation Specific > 1st Generation Specific (1979-1985)
Reload this Page >

15x7 or 15x7.5 or 15x8 rim question, also caliper clearance question (T2 brakes)?

1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

15x7 or 15x7.5 or 15x8 rim question, also caliper clearance question (T2 brakes)?

Old 02-03-09, 10:48 AM
  #1  
Banned. I got OWNED!!!
Thread Starter
iTrader: (2)
 
Join Date: Oct 2004
Location: London, Ontario
Posts: 6,122
Likes: 0
Liked 0 Times in 0 Posts
15x7 or 15x7.5 or 15x8 rim question, also caliper clearance question (T2 brakes)?

Hey guys,

So as some of you know are already aware, I'll be getting some custom rims done up for this year. Now I know I can fit a 15x7 with an offset of 10 - 20mm (4.4 - 4.8" Backspace for those of you who don't know off set) And that is with lowering springs too.

I would like to go as wide as I can, and can get the tires in 7.5" if I have too instead of 8 if i truly can't fit them and get a good ride without rubbing (No rubbing at the track too not just regular street driving that I'm worried about). Also another criteria that it has to meet is no coil overs! Although I do have plans to buy coil overs later on, but this is for incase I'd like to sell them way down the years, and have a bigger market.

So if people can post pictures of clearance inbetween the spring, and the tire, and also clearance between the fender and the tire that would be great. But please don't post a ton of pictures without knowing the exact dimensions of your rims. I'm trying to keep this as informative as possible. Also don't just post a picture of how it look in general, I've already looked at pretty much every single picture that I could find in while searching.

Lastly about the caliper, if someone with an installed setup coule help me out the dimension to the inside of the caliper, outside, and over hang. This is the sheet that I need to fill out to give you a better visual representation:

http://www.kodiakracingwheels.com/ko...ec%20sheet.pdf

Thanks guys,

Sam
dj55b is offline  
Old 02-03-09, 09:17 PM
  #2  
My 7 is my girlfriend.
10 Year Member
iTrader: (5)
 
orion84gsl's Avatar
 
Join Date: Feb 2006
Location: London, Ontario, Canada
Posts: 3,162
Likes: 0
Liked 0 Times in 0 Posts
Don't be a WUSS, get the 8's :P
orion84gsl is offline  
Old 02-03-09, 10:52 PM
  #3  
Old Fart Young at Heart
10 Year Member
iTrader: (6)
 
trochoid's Avatar
 
Join Date: Apr 2004
Location: St Joe MO
Posts: 15,147
Likes: 0
Liked 1 Time in 1 Post
When I mounted the Epsilons on the widebody, before the body kit, the tires hooked the fender lip. Rims are 15X8 with a 3-3/4" backspace. Had the backspace been in your posted range, they should fit. Tires are 225/50/15. One problem I ran into with my big brake upgrade and the SSR wheels was the inside face of the centers caught/bound up on the bump on the outer part of the TII caliper. Thinking the bump was decorative, I ground it down. Wrong.... While I was bleeding the brakes I heard a loud pop and the brake pedal went straight to the floor. That 'bump' is the transfer port between the 2 outer pistons of the calipers. Ruined 2 freshly rebuilt TII calipers that day. I don't recall the exact backspacing of the SSRs, but it's in the 4-1/2 to 4-3/4" range and clears the Eibach springs.

After I dug out and redid another set of calipers, I had to add a spacer to clear the transfer port so the wheels would even turn. Point I'm trying to make is the wheel center needs to flare away from the mounting face of the hub in order to clear the transfer port. Otherwise plan on using at least a 1/4" spacer.
trochoid is offline  
Old 02-03-09, 10:58 PM
  #4  
Old Fart Young at Heart
10 Year Member
iTrader: (6)
 
trochoid's Avatar
 
Join Date: Apr 2004
Location: St Joe MO
Posts: 15,147
Likes: 0
Liked 1 Time in 1 Post
I just went back and looked at the link you posted with the wheel dimensions. Now I see your asking about the problem I had with the 2 critical dimensions relating to the caliper. It may take a couple of days but I'll see if I can get those dimensions for you.
trochoid is offline  
Old 02-04-09, 01:06 AM
  #5  
Banned. I got OWNED!!!
Thread Starter
iTrader: (2)
 
Join Date: Oct 2004
Location: London, Ontario
Posts: 6,122
Likes: 0
Liked 0 Times in 0 Posts
cool thanks.
dj55b is offline  
Old 02-26-09, 03:23 PM
  #6  
Banned. I got OWNED!!!
Thread Starter
iTrader: (2)
 
Join Date: Oct 2004
Location: London, Ontario
Posts: 6,122
Likes: 0
Liked 0 Times in 0 Posts
Just bumping it back up to see if anyone else can pitch in ...

Also how does anyone know roughly how much our cars dip in under heavy breaking with about 170lb springs? I know this is still weight dependant but i'm just looking for a rough guesstimate.
dj55b is offline  
Old 02-26-09, 11:43 PM
  #7  
Armchair engineer
iTrader: (2)
 
j9fd3s's Avatar
 
Join Date: Mar 2001
Location: http://www.k2rd.com
Posts: 24,384
Likes: 0
Liked 107 Times in 97 Posts
best way to figure that out might be a ziptie on the shock, and then go make a couple of runs?

i dont know the offest of my wheels (i'm assuming 20), but 15x7's have over an inch of clearance between the wheel and strut, they sit pretty flush with the fenders. there is room for 15x8's but offest is kinda important.

i'm running stock brakes, cause its PP
j9fd3s is offline  
Old 02-27-09, 02:21 AM
  #8  
Banned. I got OWNED!!!
Thread Starter
iTrader: (2)
 
Join Date: Oct 2004
Location: London, Ontario
Posts: 6,122
Likes: 0
Liked 0 Times in 0 Posts
Thats a very good idea with the zip tie and will probably try that out.
dj55b is offline  
Old 02-27-09, 12:19 PM
  #9  
Armchair engineer
iTrader: (2)
 
j9fd3s's Avatar
 
Join Date: Mar 2001
Location: http://www.k2rd.com
Posts: 24,384
Likes: 0
Liked 107 Times in 97 Posts
Originally Posted by dj55b View Post
Thats a very good idea with the zip tie and will probably try that out.
if you were lazy like me, and had adjustable ride height, you could use peejays method, and lower it until the tire rubs the frame and then raise it a tad...

or take the spring out, and see how much travel you have in the first place, its actually not too hard to do that
j9fd3s is offline  
Old 02-27-09, 01:11 PM
  #10  
Banned. I got OWNED!!!
Thread Starter
iTrader: (2)
 
Join Date: Oct 2004
Location: London, Ontario
Posts: 6,122
Likes: 0
Liked 0 Times in 0 Posts
The zip tie idea should work just fine.
dj55b is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
diabolical1
2nd Generation Specific (1986-1992)
30
01-30-16 05:50 AM
Frisky Arab
2nd Generation Specific (1986-1992)
13
08-18-15 05:30 PM
Marty RE
New Member RX-7 Technical
0
08-13-15 11:19 AM


Thread Tools
Search this Thread
Quick Reply: 15x7 or 15x7.5 or 15x8 rim question, also caliper clearance question (T2 brakes)?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: