Can you reverse mount a tire on 17x8 Style 5s (bbs rc090)

[AirplaneBuilder]

Looking to get the lip cut, widened, welded on the 2 piece 17x8 style 5s (bbs rc090) but they can only do it if the tire can be mounted from the inner side of the wheel not the face/lip side. So can you reverse mount a tire on these wheels??

[etxxz]

i've seen it done a few times... yes its possible, what offset are your wheels? Maybe not every machine can do it idk. i'm not tire mounting expert, but i've done a few here and there at drift events.

[AirplaneBuilder]

^^ thanks, thats good to know. Stock the offset is et20. Anyone else reverse mounted the tires on these wheels??

[mikeedler]

correctly mounted= NO
is it possible= maybe. I would bet if it is a lower profile 40 or so it would be extremely hard not to ruin the tire.

[etxxz]

what are you talking about? its more of a machine limitation to be able to grab the rim from the front, without damaging it. Mounting the tire from the back is no different than from the front.

doing a bit more reading [google], this is actually not that uncommon to do.

[Cliche Guevara]

correctly mounted= NO
is it possible= maybe. I would bet if it is a lower profile 40 or so it would be extremely hard not to ruin the tire.

It is actually easier on the tire to reverse-mount on rc090s. The drop-center on top is very deep in the wheel and that puts a lot of stress on the bead. I've changed over countless sets on rc090s and I can tell you first hand that reverse-mount is the way to go.

what are you talking about? its more of a machine limitation to be able to grab the rim from the front, without damaging it. Mounting the tire from the back is no different than from the front.

This is somewhat true. Most wheels only allow for tires to be mounted one way or another. rc090s, along with a few other BMW BBS wheels, can be done either way, but they're the exception. It all comes down to where the drop-center is on the wheel. If you try to reverse-mount a tire on a wheel that isn't reverse-mount you'll only end up tearing the bead.

As far as clamping the wheel on the face, it all comes down to the equipment you have. Our changers have a changeable plastic insert on the clamps that protects reverse mount wheels. There actually isn't any metal contacting the wheel, just those plastic inserts.

[Cletonius]

This is somewhat true. Most wheels only allow for tires to be mounted one way or another. rc090s, along with a few other BMW BBS wheels, can be done either way, but they're the exception. It all comes down to where the drop-center is on the wheel. If you try to reverse-mount a tire on a wheel that isn't reverse-mount you'll only end up tearing the bead.

Meh, if you lube it well it should just slide down the barrell. We used to reverse mount just to fuck around, never ripped a tire in 3 years.

[IRON-E]

If your tire guy isn't a moron, he will not have any issues. That's how mine got mounted, without damaging the freshly polished lips. :)

[Cliche Guevara]

Meh, if you lube it well it should just slide down the barrell. We used to reverse mount just to fuck around, never ripped a tire in 3 years.

Again, it depends on the wheel. With something like the rc090 is doesn't make a difference, but with almost every other wheel you have to do it the right way or you'll start tearing beads and breaking duckheads. I'm not sure what kind of changer you're using, but on the newer Coats changers that we have you simply cannot change a tire unless you have a drop-center for the bead to tuck into.

[Cletonius]

Again, it depends on the wheel. With something like the rc090 is doesn't make a difference, but with almost every other wheel you have to do it the right way or you'll start tearing beads and breaking duckheads. I'm not sure what kind of changer you're using, but on the newer Coats changers that we have you simply cannot change a tire unless you have a drop-center for the bead to tuck into.

We had some used and abused coats changers. I haven't done tires since 1998 though so I'm sure technology has advanced

[mikeedler]

It is actually easier on the tire to reverse-mount on rc090s. The drop-center on top is very deep in the wheel and that puts a lot of stress on the bead. I've changed over countless sets on rc090s and I can tell you first hand that reverse-mount is the way to go.

I believe you. It's been about 2 years now since I mounted mine, and like you posted, most wheels you cannot just pick what side you want to mount/dismount from.

When I work with tires, 95% of the time it's with run on flat tires. ever mount a 30 profile RFT tire on a BMW 9.5" wide rim(E92)? fun!

BMW made us get a new mounting machine for the RFT last year, cost the boss 17,000 EUROS for the damn thing!

[AirplaneBuilder]

Thanks for all the info guys! Gotta love R3V!