tire chain recommendations?
I know that my tires are rated M+S, and will not need chains under normal snow conditions. I'm just preparing for very bad conditions since I'm going to do lot of snow driving.
Thanks,
-Gen



I know that my tires are rated M+S, and will not need chains under normal snow conditions. I'm just preparing for very bad conditions since I'm going to do lot of snow driving.
Thanks,
-Gen
Generally, chains are not recommended on AWD drive vehicles - they will confuse your ESP system...
don't bother...unless you have a 2wd ML500, which i doubt...i think there's only like 1 of them in the US
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In an AWD system, a computer is constantly reading any wheel rotation difference between the 4 wheels, and correcting power and brake pressure on each individual wheel using a set of differentials and shafts, to keep all 4 wheels spinning at the same speed.
That is why they don't even recommend changing 2 tires on an AWD vehicle...and instead change all 4 each time..
http://www.tirerack.com/tires/tirete....jsp?techid=18
"if the differentials or viscous couplings are forced to operate 100% of the time because of mismatched tires, they will experience excessive heat and unwarranted wear until they fail"
By putting chains, you are doing something similar to putting mismatched tires....deliberately confusing the computer. Yes, the computer is smart enough to figure out how to keep the car going with the chains/mismatched tires, however, in doing so, it will cause excessive wear and tear on your drive train...a few drives up and down a hill with chains could easily permanently damage the drive train.
Take my advice...never think about putting chains on an AWD vehicle...that is why if an AWD vehicle cannot climb, it is time to close to road for all traffic, and that is exactly what Caltrans does...
By the way, highway on I-80, Caltrans requires carrying chains for all vehicles including 4-wheel ones, but in 5 years, I have never been questioned once, about why I am not carrying chains with my ML..
Lastly, it may be perfectly okay to put chains on 4-wheel drive vehicle....in a 4-wheel drive vehicle, there is no computer controlling the wheel speeds...they are either free or not free to be different between the front and the rear, and the pairs may or may not be locked depending on what kind of 4-wheel system is in place...the differentials just let the wheels drive that way, without any system trying to auto-correct.
The sytems just sets itself up for matched or mismatched spins and stays that way indefinetly...unlike in AWD, where auto correction is applied almost every split second..
Last edited by mihir_d; Feb 24, 2010 at 01:43 AM.
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In an AWD system, a computer is constantly reading any wheel rotation difference between the 4 wheels, and correcting power and brake pressure on each individual wheel using a set of differentials and shafts, to keep all 4 wheels spinning at the same speed.
That is why they don't even recommend changing 2 tires on an AWD vehicle...and instead change all 4 each time..
http://www.tirerack.com/tires/tirete....jsp?techid=18
"if the differentials or viscous couplings are forced to operate 100% of the time because of mismatched tires, they will experience excessive heat and unwarranted wear until they fail"
By putting chains, you are doing something similar to putting mismatched tires....deliberately confusing the computer. Yes, the computer is smart enough to figure out how to keep the car going with the chains/mismatched tires, however, in doing so, it will cause excessive wear and tear on your drive train...a few drives up and down a hill with chains could easily permanently damage the drive train.
Take my advice...never think about putting chains on an AWD vehicle...that is why if an AWD vehicle cannot climb, it is time to close to road for all traffic, and that is exactly what Caltrans does...
By the way, highway on I-80, Caltrans requires carrying chains for all vehicles including 4-wheel ones, but in 5 years, I have never been questioned once, about why I am not carrying chains with my ML..
Lastly, it may be perfectly okay to put chains on 4-wheel drive vehicle....in a 4-wheel drive vehicle, there is no computer controlling the wheel speeds...they are either free or not free to be different between the front and the rear, and the pairs may or may not be locked depending on what kind of 4-wheel system is in place...the differentials just let the wheels drive that way, without any system trying to auto-correct.
The sytems just sets itself up for matched or mismatched spins and stays that way indefinetly...unlike in AWD, where auto correction is applied almost every split second..
Last edited by sosh; Feb 24, 2010 at 04:13 PM.
Purchased the proper diamond pattern type 'S' chains from tirechain.com. They had them in stock and shipped the same day (had them via UPS ground service in three days). Price was about one hundred dollars less than the dealer.



