Wheel Technical Terminology Question

[Mike@Blackline]

What is the technical term that a company uses when designing wheels that refers to the caliper clearance? Hub/center bore, offset, and others are the basics most people know, but what is this term for caliper clearance? For example it would vary greatly between OEM 350Z wheels with Brembos than ones without it?
Any help on this is greatly appreciated. Also, if you know this term, what is the number value to clear the non-brembos and the value to clear brembos

Thanks a lot!!!
PS the center bore for G35/350Z is 66.1 right?

[sry110]

Yes the hub diameter on the 350z is 66.1 mm.

Not sure about your first question though. I have seen companies like Work and Volk show 'disc height' or something like that in their wheel specs, i.e. a certain wheel will be 'high disc' design but I'm not sure whether that pertains to caliper/spoke clearance or what.

[Motormouth]

back spacing

[Andy@Performance]

All wheel manufacturer's use different terminology for big caliper clearance. RAYS uses "pad type".

[Z1 Performance]

if you are selling wheels (per your sig), shouldn't you sorta know this stuff?

[Z1 Performance]

^

or is there a specific wheel you are wanting to know "yes or no" on clearance?

[Motormouth]

(stifles laughter)

[sry110]

Originally Posted by Z1 Performance

if you are selling wheels (per your sig), shouldn't you sorta know this stuff?

I was thinking the same thing.

[Mike@Blackline]

we have specs from wheel companies that allow us to see if wheels will clear certain cars with certain brake options, but i dont know the technical term for it, but then again doesnt seem like anyone else does (its not backspacing, similar idea though). i just want to know this term for my own knowledge...

[Spike100]

^^ I don't believe there is any "industry standard" for the question you present. It really depends upon the car manufacturer, and handled on a case-by-case basis for specific wheels on specific cars.

Good question though... and I notice no one can answer your specific query.

--Spike

[davidv]

Originally Posted by Blackline

what is this term for caliper clearance?

There is no such term. You can have two wheels exactly the same specs. One will clear a big calliper. One will not. The difference is spoke design.

[Mike@Blackline]

Originally Posted by davidv

There is no such term. You can have two wheels exactly the same specs. One will clear a big calliper. One will not. The difference if spoke design.

exactly. but if a company was designing a wheel and sending their specs to a wheel maker, they wouldnt just say "oh heys d00d mak dis wheel to clear tree-fiddy brembos, kthnxbye!" they'd use a term with a numerical value
its not a big deal to know bc like i said it was just out of pure curiousity, but thanks thus far to those who have inputed

[Z1 Performance]

Originally Posted by Blackline

exactly. but if a company was designing a wheel and sending their specs to a wheel maker, they wouldnt just say "oh heys d00d mak dis wheel to clear tree-fiddy brembos, kthnxbye!" they'd use a term with a numerical value
its not a big deal to know bc like i said it was just out of pure curiousity, but thanks thus far to those who have inputed

right they would send the schematics of the caliper/disk combo to the manufacturer. There is no term for what you are asking for, but rather, a series of measurements that determine clearance

[Mike@Blackline]

Solved
i knew there was a universal term for it with universal numbers, i.e. a 350Z is this and a honda civic is this.
ive heard it before in passing but didnt know its what it was
X-Factor
http://en.wikipedia.org/wiki/Wheel_sizing

[Z1 Performance]

Well if its posted on Wikipedia, then it must be fact right?

They refer to it as the x-factor for a very simple reason - because it is an unknown number. That is what an x-factor is in math, it is the unknown quantity. If you want to know caliper clearance/rotor clearance for a given wheel, you need the dimensions of that caliper/rotor. This is why the various manufacturers provide the schematics of those parts, so that people can take the measurements themselves on their particular wheels, relative to the specific caliper and rotor.

[The_VQ]

It is true, X-Factor is the dimension describing the caliper clearence



This is a good scheme I have found, X-Factor is #10 on this picture and it is the same for all manufacturers (it is standarized like ET or H*PCD).

[Z1 Performance]

A very good diagram - I've seen similar ones on Fikse's site. It is standardized in that it is a measurement that is definable (like diameter, or offset both are), but it is relative to the specific wheel being discussed. So yes it is a number that can I imagine can be derived based off other numbers, which is why I suspect it is an "x" value. Measurement 11, 12 are also critical in determining brake clearance, and again, this # will vary between brake manufacturer to manufacturer. Your best bet is always to request the schematic of the particular brake kit being considered, and compare it against the known quantities of the particular wheel. The value shown I suspect is something that the customized multipiece wheel manufacturers might make available, but not sure if the one piece firms (both forged or otherwise) would or not

[The_VQ]

Oh, exactly I meant wheel manufacturers, it is not car specific, but wheel specific of course. I don't thin it can derived from anything else though, as for my opinion this dimension gives you some clues about caliper clearance but still it lefts some imprecisement.

[davidv]

Originally Posted by Blackline

Solved
i knew there was a universal term for it with universal numbers, i.e. a 350Z is this and a honda civic is this.
ive heard it before in passing but didnt know its what it was
X-Factor
http://en.wikipedia.org/wiki/Wheel_sizing

X-factor means “undefined” or “fudge-factor.”

Q: Why is Jim's car faster than mine. We have the exact same car?

A: The X-factor.

[Mike@Blackline]

Originally Posted by davidv

X-factor means “undefined” or “fudge-factor.”

Q: Why is Jim's car faster than mine. We have the exact same car?

A: The X-factor.

Sure thats not from urbandictionary.com? im sure its a common thing used in a lot of fields but in this case, thats the meaning