Welded 6" to 9" fuchs - Help..

[Olsen911]

Gents.

I have two Fuchs rims 15X6 911.361.020.00, for my ST projekt - which previously has been welded to 9" by unknown workshop, before I bought them.

My tire man has repeatedly tried to put tires on these rims - Kumho V70A 225/50VR15 (class rules) but the tires break.

Is it junk rims I've bought or is it the tires.?

All help is appreciated

[cnielsen]

Looks like the diameters of the two rims halves are different

[bpu699]

Good catch. It does look like the bead on the inside is much smaller then the outside...

[GeorgeK]

Not only that, but you need a depression of sorts, where the part of the bead that is inside the rim can go to allow for slack, so that the rest of the bead can pass over the rim.

Try putting the tire on from the back of the rim.

[jax911]

cnielsen Looks like the diameters of the two rims halves are different

That would be the stupidest mistake ever!

[docrodg]

I would not use welded rims at all. Welding on aluminum is weaker than the original metal, unlike steel. What happens if that weld fails?

[Schmierung]

There are several points that are concerning to me.

first, verify that the wheels are demensionaly correct in respect to the diameters and runout.

The area between 10 cm and 15 cm is very narrow to accomodate mounting of the tire. (George K spotted this). This may be making it difficult to spin on the tire.

I observe a distinct misalignment at about 9.5 cm. if this is consistent, then ok. The weld reinforcement should have been machined down to better facilitate tire mounting.

This wheel is using a weld metal buildup as the safety hump required for tubeless tires. I feel this bead is not consistent enough for my comfort. This should have been machined to a consistent profile.

Aluminum alloys can be successfully welded without compromising the charactoristics of the weld or parent metal. To ensure this it takes a Certified welder using a Qualified Welding Procedure. Hope you had that.

If history is unknown, I recommend having the wheels dimensionally checked by a machine shop. If good, machine the 9weld at 9.5 cm flush and the bead safety humps machined to a consistent profile. Then I would have a Non Destructive Examination firm radiograph the welds using an ofset method. Two shots 90 degrees from each should provide enough to identify porosity or lack of fusion. PM me for acceptance criterial if you get this far.

[IslandHopper]

Have these EVER had tires successfully mounted on them? I have seen custom fabbed wheels before, and no offense meant whatsoever but the build quality on these leaves much to be desired, and the inside bead diameter seems perilously smaller than the outer.
Schmierung above offers a far more scientific explanation, but I agree fully with the necessary analysis of these rims before I would feel safe using them.
I certainly don't mean to rain on anyone's parade, but personally I would have serious concerns of a tire STAYING on this rim if you ever even get one to mount properly without destroying it...