Hey guys,
I have a question about the wheel spacers I would like to order. I have the rims I am going to use on the front of the car, and its going to require me to use a spacer (large 2.5" spacer...).

I'm wondering when they are making a spacers for me (5x114.5 TII brake upgrade) they are also asking for the center bore measurement down to EXTREME accuracy (he told me to measure the center bore of the rim with a inside micrometer). In all the pictures of wheel spacers I have seen there is no reason for this because the spacer does not mate into the rim like that...

I need to get to the bottom of this right away and figure something out. I am extremely TIGHT on time and need to get something done here so my car can be moved...

The big problem is I don't have the time to take the rims to a machine shop and get this measurement taken im curious if there is any other options?

Thanks
Dan_s_young

 

BTW heres a teaser picture. Ignore the fact that the rim is a little dirty with handprints (I just mounted the tires and didn't clean my finger prints off).

 

The connection to the wheel might not be hubcentric(many are just lugcentric).....but you need the spacer to fit snugly and hubcentrically on the brake rotor.

If you dont already have a set of vernier calipers,heres a perfect excuse to buy a set.The digital ones are great and have come down in cost greatly over the last couple years.If you cant get a set,maybe someone here can take the measurement for you, off their brakes/hubs.
Just measure the OD of the bearing housing on the rotor/bearing hub.Take the measurement in the middle between the dust cap and the brake rotor wear surface.Dont worry about measuring the radius at the base of the bearing housing,typically that radius is duplicated on the wheels/spacers/adaptors when thay are machined.

 

So let me make sure im understanding you properly. Its not the center bore of the rim that needs to be measured but rather the center bore of the hub where the bearing sits?

This is the way I initally thought it would be... I will have to pick up some vernier calipers asap...

 

Stock rims are hub centric. If you can get the adapter made so that it's hub centric for both the hub and the new rims, fitment will be better.

 

As stated,stock rims are hubcentric so you can measure either the OD of the hub/bearing housing, or the ID of the stock wheel's center bore.They are pretty much a slip fit(what make them "hubcentric"),so either one should be very close to the same diameter.

 

2.5" spacers are putting a ***** load of strain on your hubs and pivot points....IMHO

 

Oh believe me im aware.... Im just going to give this a try and if I need to start changing things in the future so be it. But this will shift the weight of the car outwards more, also im running huge tires up front so im interested in seeing what the results are. Also I need to run spacers unless I have like a 5+" lip in the front, which I decided wouldn't look the way I want at all... I'm not afraid of breaking and having to replace things that break or give me troubles...

Sorry for having to claify one more time but I want to make sure I have this 100% correct. Since the wheels are aftermarket I am going to need the custom measurement (center bore of the rim) and the bearing housings measurement so the new spacers can be matched perfectly to fit?

Since these are TII bearings, lug pattern etc im running with aftermarket 5x114.3 rims all the measurements are kinda screwy..

Thanks a ton guys I appreciate the help on short notice. I bought a caliper a little bit ago here and i'll retake the measurements again and see if I can get these suckers made and mounted up.

 

My spacers/adaptors are about the same size.
I compensated for the extra strain though with my high negative offset wheels.The mounting point may be out there,but the contact patch of the tire is pretty much centered over the bearings.Been working great for almost 3 years now,have yet to need to re-torque/pack my bearings.With wide deepdish wheels,Id be more worried about the bearings, when using that thick a spacer.....

 

Ok, I went to take the measurments today with the vernier calipers and found a stupid problem. Obviously the center bore can't be measured with the calipers because they hit the edges of the rim. So I now need to try and find some telescoping transfer gauges in order to get accurate measurements I need the spacers asap.

 

Maybe, dig through a socket set and see if you can find one that fits snugly into the centerbore of the wheel.Then just measure its OD...........eh,your wheels have pretty big centerbores,I automatically thought of the little stock wheels...