ΠΑΝΤΩΣ ΕΓΩ ΣΤΑ ΔΥΣΚΟΛΑ ΚΥΚΛΟΦΟΡΟΥΣΑ ΜΕ ΤΕΣΣΕΡΗΣ ΑΛΥΣΙΔΕΣ ΓΙΑ ΣΙΓΟΥΡΙΑ ΣΤΑ ΔΥΣΚΟΛΑ ΜΕ ΧΙΟΝΙ ΥΨΟΣ ΠΕΡΙ ΤΑ 35-40 ΕΚ. ΣΕ ΑΝΗΦΟΡΑ ΠΕΡΙΠΟΥ 15-20% ΚΑΙ ΑΝΑΙΒΑΝΕ ΧΩΡΙΣ ΠΡΟΒΛΗΜΑ. ΤΟ ΠΑΡΑΚΑΤΩ ΤΕΣΤ ΠΙΣΤΕΥΩ ΟΤΙ ΔΙΚΑΙΟΛΟΓΕΙ ΤΗΝ ΑΠΟΚΤΗΣΕΙ 2 ΣΕΤ. ΒΛΕΠΕ ΣΧΕΤΙΚΟ LINK
http://4x4abc.com/ML320/ml_chainss.html
Tire chains
A traction and braking test performed by Pewag Austria demonstrates vividly how important tire chains are when snow and ice cover the roadways. New tire technology has improved the performance of snow tires dramatically, however , when it comes to maximum safety nothing comes close to good tire chains.
Traction & Climbing ability
conditions: hard packed snow, -5C / 23 F, slope 22 degrees up, distances in meters.
A - Chains on all four wheels B - Chains on one axle C - Studded snow tires D - Snow tires
Driving uphill on hard packed snow can be quite a challenge. With good snow tires you'll get up 27 meters (88 ft) before spinning tires make you wish you had chains mounted. Studded snow tires will get you 2 meters farther - not much (95 ft total). When you combine good snow tires with one pair of chains you'll reach the 32.5 meters mark (106 ft). A truly dramatic increase in traction occurs with two pairs of chains : 60 meters (197 ft) - almost twice as far as with one pair of chains.
So, if you want peak performance and maximum safety from your 4WD - you need to mount two pairs of chains.
Braking & Stopping distance
conditions: hard packed snow,- 5 C / 23 F, speed 25 km/h / 15 mph, distances in meters.
A - Chains on all four wheels B - Chains on one axle C - Studded snow tires D - Snow tires
For maximum braking and shortest stopping distances - in this test 5.5 meters (18 ft) - chains are mandatory on all four wheels (A). With chains on only one axle the stopping distance is almost twice as long - 9.0 meters (30 ft) - (B). Snow tires, studded or not, need much too long (12 meters or 40 feet) to get a vehicle stopped (C+D).
The braking test shows an identical result: If you want maximum safety from your 4WD - you need to mount two pairs of chains.
A = Snow tires plus chains on all four wheels
B = Snow tires plus chains on one axle
C = Studded snow tires
D = Snow tires
Source: PEWAG / Austria