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There seems limited choice in tyres for the GLC43's 21 inch 8.5J front and 9.0J rear setup. I was expecting to upgrade the OEM Continentals with PS4S, but to my dismay, Michelin don't do the rear 285/35/21 size. I've had the PS4S on previous cars, so I really want them as they have been top notch.
My question is, Has anyone any experience of over-sizing to the 265/40(F) & 295/35(R) on the 43's 21 inch 8.5 and 9.0 Wheels? I notice they are beyond the recommendation of tyre/rim sizing combinations, but also notice its not an uncommon fitment according to the interwebs. I've seen a couple of guy do it on there GLCs on this forum, but with little info on results. To compound matters, my local tyre shop said they wont fit. My car is lowered with the dongle and has 15mm spacers on if that makes a difference, although I can take them off if need be.
I have really bad crabbing with my Continentals as they wear (I had no crabbing for the first 10K), do you think over-sizing would make this worse? What about handling and safety? Would welcome alternative recommendations if over-sizing is a no-go, I'm looking for summer tyres only, as I live in a hot climate.
TIA
Have you seen member GC 63 's set up (White with Bronze rims) ? Although he has aftermarket wheels he is running some meats. I will eventually be running a meaty tire set up similar to his just want to use the 21's if possible. Any luck finding anything ?
I can't find that user. There really is little on the market in 285/35/21 size. If I had to choose today, I'd have to go with the PZero (Non-run flat). Really want the PS4S if I can over-size though. A few users over here https://mbworld.org/forums/glc43-glc...placement.html have over-sized to Scorpion AS it seems with no issue. Further down in the same thread there is someone who put on the PS4S 295's, no report on how successful that was though.
I can't find that user. There really is little on the market in 285/35/21 size. If I had to choose today, I'd have to go with the PZero (Non-run flat). Really want the PS4S if I can over-size though. A few users over here https://mbworld.org/forums/glc43-glc...placement.html have over-sized to Scorpion AS it seems with no issue. Further down in the same thread there is someone who put on the PS4S 295's, no report on how successful that was though.
I'd check on Tire Rack what the specs are of the PS4 before ordering. (Or message someone who's put them on to verify fitment) There can be a huge difference in size from one 265 to another, possible that the Michelin runs wider than the Pirelli snow tire. You wouldn't have any issue in the rear but the front clearance is minimal from the control arm. (You could always add a 12mm spacer if needed) . That said, I've seen people saying the Michelin has crabbing issues too.
I'd check on Tire Rack what the specs are of the PS4 before ordering. (Or message someone who's put them on to verify fitment) There can be a huge difference in size from one 265 to another, possible that the Michelin runs wider than the Pirelli snow tire. You wouldn't have any issue in the rear but the front clearance is minimal from the control arm. (You could always add a 12mm spacer if needed) . That said, I've seen people saying the Michelin has crabbing issues too.
I've recently put Continental Extreme Contact Sports on (275/315, not factory wheels) . Hoping I don't run into the same crabbing you did after 10K! So far there's none.
Interesting food for thought thx. I run 15mm spacers all round already. Michelin do the straight replacement for the front (255/40/21) if that's an option, but that means I'd be over-sizing the rear only, I know precious little about over-sizing as it is, let alone the implications of only over-sizing the rears. I don't plan on entering any drag races lol.. If 'tread width' is my only issue, then the difference between stock and the Michelin's is only 0.2" according to tire rack, with sectional width difference of 0.4". I run the Contisportcontact 5P on a right hand drive, so you've probably dodged a bullet as far as crabbing goes. I had a C43 with PS4S's, and I didn't even know of a crabbing issue until i got the GLC.
Interesting food for thought thx. I run 15mm spacers all round already. Michelin do the straight replacement for the front (255/40/21) if that's an option, but that means I'd be over-sizing the rear only, I know precious little about over-sizing as it is, let alone the implications of only over-sizing the rears. I don't plan on entering any drag races lol.. If 'tread width' is my only issue, then the difference between stock and the Michelin's is only 0.2" according to tire rack, with sectional width difference of 0.4". I run the Contisportcontact 5P on a right hand drive, so you've probably dodged a bullet as far as crabbing goes. I had a C43 with PS4S's, and I didn't even know of a crabbing issue until i got the GLC.
You're totally fine for clearance then, the only "issue" is running a tire wider than the recommended width for the rim. (It wouldn't bother me, it's pretty close)
Assuming Tire Rack has the right specs for the tire (they were wrong on one I checked when figuring out tires, I only knew this because they had the same width showing for both a 265 and 295) technically the actual sectional width will be 0.4" LESS than what they show because they measured it on a 9.5" wide rim and you're using 8.5".
Overall height/diameter is important with 4matic/AWD. Mixing 255 front and 295 rear isn't good because they're too different in size.
I'm not sure where you live, but if they do inspections there do you have to have stock sizes?
You're totally fine for clearance then, the only "issue" is running a tire wider than the recommended width for the rim. (It wouldn't bother me, it's pretty close)
Assuming Tire Rack has the right specs for the tire (they were wrong on one I checked when figuring out tires, I only knew this because they had the same width showing for both a 265 and 295) technically the actual sectional width will be 0.4" LESS than what they show because they measured it on a 9.5" wide rim and you're using 8.5".
Overall height/diameter is important with 4matic/AWD. Mixing 255 front and 295 rear isn't good because they're too different in size.
I'm not sure where you live, but if they do inspections there do you have to have stock sizes?
Thanks. I think I'm going to go for it. As you say, the width difference is minimal. As for the rolling radius discussed, the 265/40 and 285/35 on the PS4S is better than the Continentals. 715 and 717 rev/mile for front and rear for the Michelins.
Interesting read, makes sense on an AWD. Article says that "the resulting 4 revolutions per mile difference can place a continuous strain on the tires and vehicle's driveline.", which is a little disconcerting as MB with their 255/40 F and 275/35 R Continentals staggered setup from the factory are 716 and 720 rev/mile respectively (according to tire rack anyway)
Thanks. I think I'm going to go for it. As you say, the width difference is minimal. As for the rolling radius discussed, the 265/40 and 285/35 on the PS4S is better than the Continentals. 715 and 717 rev/mile for front and rear for the Michelins.
Interesting read, makes sense on an AWD. Article says that "the resulting 4 revolutions per mile difference can place a continuous strain on the tires and vehicle's driveline.", which is a little disconcerting as MB with their 255/40 F and 275/35 R Continentals staggered setup from the factory are 716 and 720 rev/mile respectively (according to tire rack anyway)
Stock should be 255f/285r for 43 and 265f/295r for 63
There seems limited choice in tyres for the GLC43's 21 inch 8.5J front and 9.0J rear setup. I was expecting to upgrade the OEM Continentals with PS4S, but to my dismay, Michelin don't do the rear 285/35/21 size. I've had the PS4S on previous cars, so I really want them as they have been top notch.
My question is, Has anyone any experience of over-sizing to the 265/40(F) & 295/35(R) on the 43's 21 inch 8.5 and 9.0 Wheels? I notice they are beyond the recommendation of tyre/rim sizing combinations, but also notice its not an uncommon fitment according to the interwebs. I've seen a couple of guy do it on there GLCs on this forum, but with little info on results. To compound matters, my local tyre shop said they wont fit. My car is lowered with the dongle and has 15mm spacers on if that makes a difference, although I can take them off if need be.
I have really bad crabbing with my Continentals as they wear (I had no crabbing for the first 10K), do you think over-sizing would make this worse? What about handling and safety? Would welcome alternative recommendations if over-sizing is a no-go, I'm looking for summer tyres only, as I live in a hot climate.
TIA
Just buy my oem 21s from my glc63 they come with 285s in the rear
Thanks. I think I'm going to go for it. As you say, the width difference is minimal. As for the rolling radius discussed, the 265/40 and 285/35 on the PS4S is better than the Continentals. 715 and 717 rev/mile for front and rear for the Michelins.
Interesting read, makes sense on an AWD. Article says that "the resulting 4 revolutions per mile difference can place a continuous strain on the tires and vehicle's driveline.", which is a little disconcerting as MB with their 255/40 F and 275/35 R Continentals staggered setup from the factory are 716 and 720 rev/mile respectively (according to tire rack anyway)
I just bought new DWS 06+ tires for my GLC 43 coupe yesterday. These replaced my old Continental Contiportcontact 5 UHP summer tires which crabbed like crazy in temps below 70°F. So far, no crabbing with the DWS06 Plus tires.
also, the 265/40/21 & 295/35/21 tires fit and look great on the OEM 21” wheels.
I just bought new DWS 06+ tires for my GLC 43 coupe yesterday. These replaced my old Continental Contiportcontact 5 UHP summer tires which crabbed like crazy in temps below 70°F. So far, no crabbing with the DWS06 Plus tires.
also, the 265/40/21 & 295/35/21 tires fit and look great on the OEM 21” wheels.
Have any pics of them installed? I’m due for tires soon, and am also looking to upsize!
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