I've been looking at wheels for a while now and one thing in particular has always had my interests peaked. Most multi-piece wheels have a hump on the inside edge of the hoop, with single piece and cast wheels it's not there. It only seems to be on forged wheels. Most wheels are smooth on the inside, but the multi-piece wheels have this bump on the inside and the face on the outside, so there is a low spot in the wheel that collects water. It's a PITA to wash your car cause water always get's trapped and I've heard that it also causes vibrations at high speeds in the rain. Is there a reason for this? or is it a design oversight. The only thing I could think of was that it adds strength to the inside hoop since the outside hoop has the face to prevent it from deflecting. But if this is the case how come single piece wheels don't need it. Attached is a pic of what I'm talking about.



edit: oops wrong forum, please move to wheels and tires.

 

it's there for tire mounting purposes, my 2 piece foose wheels have it and yes it does collect water when washing the car or during rain, no vibration at speed though

 

what does it do for tire mounting? I don't see how it could be for the bead since there isn't one on the face side.

 

the recess area is just a physical characteristic of multi-piece wheels.
i recommend you get a leaf blower or get a air compressor to blow out
the water that collects there after a wash.

i do not use my 3pcs wheels on my commuters cause i don't like
washing it all the time. i recommend a simple 1pc wheel for daily
driven cars.

 

It took me a while to see what you were trying to describe. Now I see it and I agree with the added strength statement.

I'm not sure, but if you look at most one piece wheels, the spoke design isn't flat, but rather it's contoured so that it supports more of the wheel width wise where as the 2pc and 3pc wheels, the face is machined out of a disc and therefore doesn't have the thickness and added support in the spoke design. Also, since the majority of the offset of the wheels are positive, the front of the hoop has more support from the spokes and the back has less. Therefore to add strength, a roll is added to the hoop.

 

it is not for strength, when mounting a tire you have to have a place for the bead of the tire to go so that it can stretch around the outer edge of the lip, there is only one because you put a tire on from only one side of the wheel, 1 piece wheels have the recess, it is normally where the spokes attach to the rim so it is not noticable but on 2 or 3 piece wheels it has to be smooth in that area or the center section would look silly being so small, besides that, i have had my wheels apart before and there is a ring on the wheel hoop that is 3/4" tall and about 3/8 to 1/2" thick to bolt the center section to, so there is plenty of strength there to support it

 

Are we talking about the same thing? You're saying the bead of the tire sits on the red part?

 

we are talking about the same thing but you are missing the point, think of when you are putting the tire on, it is pushed over the outer edge of the lip into the "red part" so that the rest of the tires bead can be stretched over the lip,the bead of the tire doesn't actually stretch so it has to be able to be ovaled(best way i can describe it,lol), on a 19" wheel the outer edge is 20"s, so i hope this explains it



i tried,lol

 

You will usually only see this "valley" on multi-piece wheels with a Reverse Lip. A step lip wheel will not have this but for strength purposes, a reverse lip wheel (as pictured above) will have this to make up for the lack of stength as opposed to the step lip style.

 

I'm surprised you have only one lock on those dpe's. If someone wants your stuff they will get get it but I believe in making it harder for them. I have 5 locks on every wheel of my expensive wheels. Plus, it looks better.

Edit: I just re-read the origianl post. It doesn't say those are your wheels. Whomever they belong to, they aren't cheap. They should have 5 locks.

 

yeah those are my wheels, just one lock but the other 4 lugs are spline drives so that makes them a little more difficult to remove too. I checked the lugs and a 6pt or 12 pt socket won't grab them so you need the key for the splines too. I made sure the spline drive lugs could not be removed with a standard socket. My last set of spine drive lugs could also be removed with a regular socket so they were basically useless as far as security goes.

 

1 lock or 5. It doesn't really matter for the thieves. All you have to do is put a thick wall tubing about 2 feet long over the lock, stand on it, break the studs, and take the wheels. Faster than a impact wrench.

 

someone's into thievery. LOL ^

 

i dont think the studs will break that easy..

 

Well. I've never done it before (steal wheels that is), but it is pretty easy to break studs.

One time my roommate had some new wheels put on. The shop tightened the lugs too tight. We found out that the tires were put on backwards so we tried to swap the wheels ourselves. We couldn't get it to budge, so my other (and fatter) roommate decided to put the lug wrench on and stand on it thinking he could get more force. Of course he didn't support the wrench underneath at the lug, and next thing you know, SNAP!