ryans1000

Does the convertible 5 bolts fit the fc tii ? same thing?

also how do fd spares fit, do they have a different offset?

RotaryRocket88

iTrader: (7)

All 5-lug FC and FD wheels have the same bolt pattern: 5x114.3.

Stock FD rims have a different offset than FC rims, so I would guess that the spare could require a spacer as well.

Rob XX 7

iTrader: (8)

convertible spare works for any 5 lug FC

TrboSpdAnt

iTrader: (5)

Offsets are different, but the lug is the same:

5 x 4.25. Same as the 350z, G35, a couple Corvettes and some Mustangs

breckboarder55

Its been a really long time since I have touched my spare, but IIRC it is pretty damn heavy to want to use it as a "skinny".

ryans1000

not sure on the weight but its their are aluminum versions and steel versions on the fc

breckboarder55

What's the speed rating of the tire? Will you be replacing the tires?

ryans1000

The aluminum rims are also name brand Enkei. speed rating on the spare radial is only 50mph, however ari has had them up at 150mph so I hear. Most people will want bias on the skinnies to match bias drag rears. 16" skinnies are rare so people either run motorcycle tires or better yet coker tires.

I will run coker tires EXCELSIOR http://store.cokertire.com/500-525-1...wall-tire.html . They are dot certified at 112mph sustained so brief high speed drag runs should be fine. These have an 827lb load rating.

these heavier coker firestone replicas have been used more often probably because the EXCELSIOR wasn't released yet, the http://store.cokertire.com/500-525-1...blackwall.html , they have been at over 160mph on supras so I hear. They are used on ccw drag packs.

Also the Excelsior is only 26" tall vs the 26.5 firestone and thats kinda tall for a rx7. firestone has the higher load rating at 1070lbs each

breckboarder55

1987 Turbo II stock spare tire and rim - 24.85 pounds

ryans1000

I would think the tire itself should weigh 12-16 pounds. So the rim probably weighs 9 to 13 pounds. Mickey thompson skinnies 15" weigh about 8lbs. I think a full size tire and rim weigh about 50lbs total. Good cheap weight savings

sleeping-7

iTrader: (31)

Here's some info on the FD And FC spares to help you out.

The FD spares are 16x4 and have a +40 offset. They clear the TII brakes with no probems. The hub bore on the FD is larger than the FC, so for proper fitment you'd need hub centric rings. The weight of the FD spare with a radial 130/90-16 h-rated bike tire is 26lbs according to my bathroom scale.
Caliper clearance...


The FC TII Aluminum spare is 16x4 with a +30 offset. with factory 135/70-16 spare tire it weights 24.6lbs according to my bathroom scale.
Caliper clearance...


The FC Vert spare is 15x4 and I would guess the same +30 offset as the TII spare. Will fit all 5-lug FCs as the Verts have the larger brakes.

The FC Steel spare is 15x4, not sure the offset but would guess +30. With a factory 135/70-15 spare tire it weighs 23lbs.

flaco

iTrader: (7)

yeah but use with a different tire ... if the back gets loose you wont be able to get it back str8 ... im telling you from experience

daviddeep

iTrader: (4)

Actually, the 'Verts used the same 16" aluminum spare as the TII. There may have been a few oddballs that left the factory with the 5-lug steel spare, but most were aluminum. Although there were 15" aluminum spares in the '86-87 base cars, these were 4-lug only. Not sure about the '88s, but I've never seen a steel 15" FC spare. Both of my 5-lug GTU cars ('88 and '90) had 16" steel spares with the same specs and offset as the aluminum 5-lug spare; also the same T135/70-D16 tires.

sleeping-7

iTrader: (31)

That's interesting, I always assumed the verts came with a 15" aluminum spare since they came with 15" wheels, the TII and GTUs came with 16" aluminum spares, and the rest steel spares. Learned something new!

My 90 GTU came with a steel 15" spare and I upgraded it to a 16" TII spare.

daviddeep

iTrader: (4)

Hmm... Now I have to wonder if I'm remembering my '90 GTU spare incorrectly. My '88 GTU had its original spare tire when I bought it and it is definitely steel and definitely 16". I was almost certain the spare in my '90 was a 16" steelie, but maybe I'm wrong. I've bought a couple different 16" aluminum spares over the years, both from guys who said they came from 'Verts. There was a thread discussion of spares a couple years ago in which a number of 'Vert owners said their cars had the aluminum 16" spare.

I just looked in the '88 and '90 FSMs and see that according to the wheel specifications chart, the steel spares were supposedly all 15" in 1990 (page G-2), though in 1988 they were all supposed to be 16" (page 12-2).

It's kind of mind-boggling all the small changes Mazda made to these cars over the seven years they were built. I never realized there were 15" and 16" steel spares, so now I've learned something new myself.

Incidentally, I think the aluminum spares were generally found in TIIs, 'Verts, base 4-lug cars, and the GTUs.

When I compared the weight of my steel spare and tire to an aluminum one, I was disappointed to discover a pretty measly 3 lb. weight savings for the aluminum. Hard to believe Mazda contracted with Enkei to cast them a special spare wheel to save a lousy 3 pounds on just a few FC models.