I have been offered a 635csi, which according to the vendor has " the original metric sport alloys with superb matching Michelin TRX tyres all around."

From the buying guides I understand there is a problem with TRX tyres; what is it? And does TRX refer to the tyres only, or are the alloys called TRX too?

here's a tiny pic of the wheel on the car for sale;

h**p://snipurl.com/tbn6-YWMWFD

Many thanks!


[edit] Did a little research and answered my own question;

"The invention of the TRX by Michelin in 1973 was the first instance of tyre and rim being designed to work together as a single unit. The new TRX rim was designed with a lower, flatter flange than that of conventional rims. The bead of the TRX tyre was also altered to suit this new rim design and the result is a more gradual curvature of the tyre sidewall giving exceptional directional stability and ‘on the limit’ handling, whilst also allowing for a comfortable ride.

These Michelin TRX tyres and rims were standard fitment on many performance cars of the seventies, eighties and early nineties, such as Ferrari, BMW, Renault Alpine, Alfa Romeo, Peugeot and Renault 5 Turbo. "

Is the problem that the TRX tyres are expensive? Or not very good? Or both? Does the picture (above) indeed show a TRX wheel?

Maybe they don't produce them anymore? Or probably on a very limited basis?

I'd call up a Michelin vendor and just ask about their availability and price...That aside, don't let the car slip away over the tires.

expense is probably the biggest factor.well over $200(US $$$) a tire.plus some say that it is old technology now,as far as tires go.

makes sense; and does the TRX wheel (as in the picture, above) only take TRX tyres?

Coker Tires sells the TRXs .I think the 415s are like $150 a piece. I just bought a set for my Ferrari 400i ,they are the same size as the M635s.

Generally speaking, the TRX tires are considered old technology and not as good as other tires available at much lower prices. I think the modern makers (Michelin and Coker) have pretty good products, but low volume makes them expensive. If your goal is to keep the car original, then stick w/ TRX. Most of us have switched to newer wheels that give you much broader options. There are several that keep a very stock appearance.

This same curse applies to many of the 79-86 Ford Mustang/Mercury Capri cars, as well as some other Ford/Mercs of the era. The completely stuck on stock and show types will spend the money for the appropriate TRX tires, and then get a set of wheels and much more reasonable tires for driving.

We've managed to find a set of really nice Ford-type TRX wheels with very nice tires for one of our cars that we'll be restoring in the future.

All depends on what you want for the car and what you're willing to do, but the TRXs were offered to me with my M6, and I didn't want the hassle of trying to wedge them in the car for the drive back, so I passed and haven't a single regret.

The problem is pretty simple. ONLY Michelin TRX Tires fit these rims. It's possible that remolds are still available in these sizes, but aside from that lousy option, you can buy the Michelin TRX or the.. well, the Michelin TRX.

About 30 years ago the Michelin TRX was the cutting edge of technology, today it's badly outclassed. Heck, 20 years ago the hot setup was to ditch TRX wheels and go with 15s or 16s.

If you are looking at a 635, the car should use 220-55VR390s. If they are even still available in that speed rating, they cost $220-230 each.

Meanwhile, in a 225-50-16 you can get decent tires for $75 each and amazingly good tires for $150 each.

Sort of like saying "Well we can sell you this 1985 Cell phone for $500 or you can buy a brand new motorola RAZR for $250"

The problem is pretty simple. ONLY Michelin TRX Tires fit these rims. It's possible that remolds are still available in these sizes, but aside from that lousy option, you can buy the Michelin TRX or the.. well, the Michelin TRX.

About 30 years ago the Michelin TRX was the cutting edge of technology, today it's badly outclassed. Heck, 20 years ago the hot setup was to ditch TRX wheels and go with 15s or 16s.

If you are looking at a 635, the car should use 220-55VR390s. If they are even still available in that speed rating, they cost $220-230 each.

Meanwhile, in a 225-50-16 you can get decent tires for $75 each and amazingly good tires for $150 each.

Sort of like saying "Well we can sell you this 1985 Cell phone for $500 or you can buy a brand new motorola RAZR for $250"

Well put.

That's it in a nutshell.

so why does this guy has Perelli Cinturato 225/50/VR16 mounted his??

so why does this guy has Perelli Cinturato 225/50/VR16 mounted his??

Because they are not TRX wheels. I would like to see how you could mount a 16" tire on a 15.35" wheel. Or maybe those P7's are so old that they shrank. Post a pic showing the #'s cast into the wheel for further clarification.

the rims is 16in with 225-50-16in tires just like another memeber on the board thats trying to sell his set

and heres another guy with 205-55-15s



http://i8.tinypic.com/4xmtq4x.jpg

they can only be different wheels. no other explanation

if there was a way to fit normal tires on TRX wheels someone would have figured it out a long time ago and everyone would be doing it

the rims is 16in with 225-50-16in tires just like another memeber on the board thats trying to sell his set

You left out this picture that shows the size cast into the wheel.
http://i43.photobucket.com/albums/e398/Rickysbmw320i/DSCN0823.jpgou

and heres another guy with 205-55-15s



http://i8.tinypic.com/4xmtq4x.jpg

You are confusing the size of a rim with the style of a rim. The very fact that they are 15" means that they are NOT TRX's!

TRX refers to a size - 390mm (approx. 15 3/8")* in this case.

The "basket weave" design above and with the gold centers are known as "Style 5's" by BMW and they come in many different sizes - 14", 15", 16", 17" and the *"TRX" sizes 390mm, 415mm.

The Style 5's from BMW have several variations with the most common one having very little "Lip", the one pictured above with a small Lip and the most sought after, the 2 piece with the bolted on center hub and a large Lip. And then there are the offerings direct from BBS like the gold hubs pictured above.

Check out this link for a site listing all of the wheels from BMW with sizes, offsets and what cars they came on. just click on the picture to see the info:

http://felgenkatalog.auto-treff.com/

As to "What's wrong with TRX's"? The price has skyrocketed to $400 per tire! :eyecrazy

- 'nuf said.

I am not sure what this guy is trying to accomplish. He has posted this same BS in most every area here and seems to be selling a lot of wheels so he should know what TRX tires/wheels are. If not, he has received very detailed and informative posts about the issues but still continues to post crap. If he still does not understand what TRX wheels are, I apoligise for my comments, but if he wants to be taken seriously, maybe he should be clear about what he is trying to accomplish. And if he does manage to mount 15 or 16" tires on the TRX wheels, I am glad that my family is not traveling the same roads as he is.

I am not sure what this guy is trying to accomplish. He has posted this same BS in most every area here and seems to be selling a lot of wheels so he should know what TRX tires/wheels are. If not, he has received very detailed and informative posts about the issues but still continues to post crap. If he still does not understand what TRX wheels are, I apoligise for my comments, but if he wants to be taken seriously, maybe he should be clear about what he is trying to accomplish. And if he does manage to mount 15 or 16" tires on the TRX wheels, I am glad that my family is not traveling the same roads as he is.



bro what the hell is your prb get a life!! im just trying to make sure and help out another member on the board!! if you dont like it then just dont click on here . you keep telling me that they will only fit trx tires and i just showed 2 sets of the same rims from a 7 series with pirelli's.

Well "bro" trx wheels (whatever style) in 390mm will handle 390 TRX tires only. TRX wheels in 415mm will only handle 415 TRX tires. 16" wheels (even if they look the same) will only handle 16" tires and the same goes for 15". The wheels that you posted WITHOUT TIRES are marked TRX390 and show the special bead design that is clearly shown on these pictures. The other wheels that you show are NOT TRX wheels. This has been pointed out to you in several places but you keep showing us pictures of other wheels. The wheels in the thread for sale are very nice but are only for the 390mm TRX tires and nothing else will mount properly. So it you are really trying to help somebody out, tell them that they should research TRX sizing and pricing before they make the purchase. In the orther forums you posted in, you have been given plenty of information about why you can not mount non TRX tires on TRX rims. TRX is no more a style than 14" but it is a size and design for the bead as has been detailed for you with specific seat angles by others elsewhere. Contact BBS and ask them to clear this up. As has been posted that wheel was offered in TRX sizes as well as 14, 15 and 16" sizes. I think that everyone has shown why 16" or 15" tires will not fit on the TRX rims that are shown for sale here.

Good luck