FF Performance Alloy Wheels

[Rondo]

Set of 4 5.5jjx13 FF Wheels. 4 inch offset, 3 3/4" bolt patterm, 5/8 diameter steel insert bolt holes. Some scratches and dings but fully useable. I used on 1985 Reynard. If interested can send detail pics of each one

$Sold In mid atlantic we will figure out delivery

[Rondo]

new price - btt

[DaveW]

Is that offset correct? Seems like a lot for 5.5" wheels...

[kea]

Dave,
That could be correct.
They (UK) started using wheels (steel) that were easily available, and then an aluminum spacer to make up the difference to the offset they has used in the past. These alloy wheels were probably based on that combination.

[sc94]

Maybe he meant 4" backspace.

[DaveW]

Maybe he meant 4" backspace.

4" backspace also seems like a lot...

[DaveW]

Dave,
That could be correct.
They (UK) started using wheels (steel) that were easily available, and then an aluminum spacer to make up the difference to the offset they has used in the past. These alloy wheels were probably based on that combination.

Yeah, that explanation makes sense. Thanks.

[Neil Porter]

Crossle 55, 60, and 70 FF used a 3.9 back space from the factory. They used a Fiat Panda hub/bearing unit on all four corners of the 55 and on the front of the 60 and 70 cars. The bearing huts wore out quickly and we have since make a custom replacement that has a bearing that is replaceable. In the stock hub/bearing units the bearing could not be replaced. Not sure if the bearing were why they used that back space or if it had something to do with the suspension design. Most likely it was the design of the suspension. Neil

[Earley Motorsports]

Maybe it was because the Fiat Panda was front wheel drive and FWD cars have alot more back spacing on the wheel than RWD cars.
Graham.

[Scott Blake]

MSG sent

[Rondo]

On the reynard it used an aluminum spacer - at least 1/2 thick perhaps more. I never measured them..still for sale

[Motorsport Services]

Not to hijack Rondo's thread, but have a full set of the same wheels, new (never mounted)
5.5 x 13, 3.75" OC, 4.00" BS, 9.5 lbs. $125 ea plus shipping

Motorsport Services
(435) 783-2933

[Rondo]

Lowered price

[Rondo]

They need a good home!!!

[Scott Blake]

PM sent

[Rondo]

Reduced price...btt

[formulasuper]

These are the same wheels that were on the #40 Lola T440 I restored & sold while at the FF 40th reunion a few yrs ago and they worked fine on that car. Always thought they looked good, sorta Ferrari like.

[kea]

These are the same wheels that were on the #40 Lola T440 I restored & sold while at the FF 40th reunion a few yrs ago and they worked fine on that car. Always thought they looked good, sorta Ferrari like.

T440 Lola has a different bolt circle then the wheels that are being offered.

[formulasuper]

T440 Lola has a different bolt circle then the wheels that are being offered.

True, they were drilled for the older Lola bolt pattern diameter so don't buy them for a T440.

[Albatross]

Well....O.K. for my benefit and the newbies: How is "back space" measured? TIA

[Earley Motorsports]

How to Measure Wheel BackSpace

[/FONT]Items required to measure wheel backspace: Tape measure, Straight edge, Wheel w/o tire (preferred)
The easiest way to measure backspace is to lay the wheel face down onto the ground so the backside of the wheel is facing up. Take a straight edge and lay it diagonally across the inboard flange of the wheel. Take a tape measure and measure the distance from where the straight edge contacts the inboard flange to the hub mounting pad of the wheel. This measurement is backspace. The above photo shows three wheels with 2",3", & 4" backspace.
Cheers, Graham.

[DaveW]

IMO, the diagram is confusing. The measurement needs to be from the wheel mounting surface to the inboard flange where the tire contacts the rim, not to the extreme rear of the wheel.

Backspace is supposed to be a measure of wheel offset, which relates to the tire position, and should not include the thickness/width of the inner flange.

[iskifly]

Ok, silly question but will these fit a Crossle 50? I'm using Porter Racing hubs, they are awesome by the way, compared to the Panda hubs. Are they still for sale?

[Earley Motorsports]

This is where I got the back spacing info from.
https://www.rsracing.com/tech-wheel.html

Cheers, Graham.

[DaveW]

This is where I got the back spacing info from.
https://www.rsracing.com/tech-wheel.html

Cheers, Graham.

Well, they have conflicting info there. They indicate, correctly, the wheel width, but then measure offset or backspace to the back of the rim. Again, the back of the rim has no direct bearing on the tire location, and, therefore, on the offset or backspace.

[Earley Motorsports]

Sorry Dave, no offense, Coker Tire and Weld Wheels just to mention a couple all measure back spacing from the outer lip also. They say the outer most surface.

Cheers, Graham.

[DaveW]

Sorry Dave, no offense, Coker Tire and Weld Wheels just to mention a couple all measure back spacing from the outer lip also. They say the outer most surface.

Cheers, Graham.

No offense taken, but...
They can measure any way they want (and it is, obviously, the easy way to do it), but the only way you will know the true offset and tire position is to measure the way I described. There are too many rim configurations and inner rim-edge widths/thicknesses for their method to be consistent, especially between rims from different manufacturers. What you want to know (for handling and tire clearance purposes) is "where is the tire with respect to the mounting surface," and using the outer edge will not give consistent results if the rim configurations are different. That is especially true comparing modular having rolled rim sections vs 1-piece cast rims.

So to be precise and know exactly what you are getting, one has to measure the way I described. In the diagram below, the "B" dimension is the backspace.

If you are looking only for rough values, the measurement to the extreme rear will give you that. However, with the close tolerances present in racing vehicles, it is, IMO, necessary to know those dimensions as precisely as possible.

[Albatross]

As Aristotle said: "when you debate me. First, please define your terms." Now we know.

[kea]

Well, they have conflicting info there. They indicate, correctly, the wheel width, but then measure offset or backspace to the back of the rim. Again, the back of the rim has no direct bearing on the tire location, and, therefore, on the offset or backspace.

BUT, backspace measured to the edge of the wheel does have a direct bearing to ordering wheels from a manufacture.

[DaveW]

BUT, backspace measured to the edge of the wheel does have a direct bearing to ordering wheels from a manufacture.

OK, Keith, answer me these questions:

So, to get the offset and, therefore, the handling and clearance dimensions and characteristics you want, you have to know their rear rim dimension from tire surface to rearmost extension in advance?

For street vehicles I have always ordered by diameter, width, and offset dimensions.

For race vehicles I want to get the same 3 dimensions equal to my specifications.

Why would a wheel maker, other than for ease of measurement, use a dimension that does not directly define the offset and the inboard (and outboard) extension of the tire?

[racerdad2]

Two different measurements. Back space for wheel. Back space for tire. I need to know wheel back space to clear calipers, etc. My tire back space for other clearances & tire - suspension geometries. All of which makes what little grey matter I have left, short-circuit

[DaveW]

Well, I guess now everyone reading this knows the difference between the 2 measurements and can now make an educated decision when it is necessary!

[Earley Motorsports]

Well, I guess now everyone reading this knows the difference between the 2 measurements and can now make an educated decision when it is necessary!

[Albatross]

Well, I guess now everyone reading this knows the difference between the 2 measurements and can now make an educated decision when it is necessary!

Didn't mean to; hated to sound naive, now I don't feel so bad. Will make a good test question in the future.

[Rondo]

Sold - thanks Apexspeed

[marshall9]

Well, I guess now everyone reading this knows the difference between the 2 measurements and can now make an educated decision when it is necessary!

Actually, I am now thoroughly confused

[Motorsport Services]

New, never mounted. $500 plus shipping for the set

Motorsport Services
(435) 783-2933