Modern Tire Dealer

JUN 2019

Magazine for the professional tire industry

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33 w w w . M o d e r n T i r e D e a l e r . c o m drop center wheels can only be demounted and mounted when clamped upside down so the drop center balcony side is closest to the flange always facing upwards. "A wheel with negative offset is always suspect," says Scribner. "Look inside the tire when bead loosening and find the drop center while lubricating the tire using a liquid lube and preparing the wheel for demounting." a tire to not center correctly on a balancer. But usually failure to center the tire is due to shortcuts and poor practices. Front coning is a big culprit. e back of almost all wheels is machined for centering while the front of the wheel is to be used for the center cap. "Make sure you are using the back side of the wheel when centering," says Liebetreu. "We sort of designed around that with our collet system. Collets are lower taper, more direct fitting for each wheel." Liebetreu says Hunter Road Force Elite balancers, which are equipped with cameras, can spot a lot of centering problems. "If you have a lower-end machine you basically have to watch for that yourself or watch for a weight answer that just doesn't seem logical. Many of our balancers have a more manual version of centering where you clamp, you rotate 180 degrees and reclamp. If you get the same answer for the balancer then you know it is the wheel that is out of round. If you get a different answer then you know the clamping is the problem." BALANCING MISTAKE: NOT USING A FLANGE PLATE ON A CLAD WHEEL e risk of damaging a clad wheel is greater on a wheel balancer than on a tire changing machine. "If you don't use a flange plate, if you just clamp on to that plastic wheel face, you are going to damage it. And you are not going to get a good clamp because that plastic is just going to give," says Liebetreu. Liebetreu shared ways to avoid the most common mounting and balancing mistakes during Modern Tire Dealer's recent visit to Hunter's headquarters in Bridgeton, Mo. We also asked other manufacturers of mounting and balancing equipment to address common problems. e respondents were Dave Scribner, product development manager at CEMB USA/BL Systems Inc., Don Vanderheyden, director of marketing at Hennessy Industries Inc., and Kevin Jones, wheel service product manager for the Rotary wheel service division of Vehicle Service Group. TIPS FROM CEMB USA Scribner outlined ways to prevent five common tire mounting mistakes as well as four balancing mistakes. MOUNTING MISTAKE: INSIDE CLAMPING ALLOY WHEELS On table top tire changers, avoid using clamping jaw teeth to inside clamp alloy wheels, which damages the rim. "Always outside clamp alloy wheels. Bead press systems are much easier to push the wheel downwards with the tire bead loosened when it is outside clamped," says Scribner. MOUNTING MISTAKE: REVERSED WHEELS CLAMPED FACING UPWARDS To prevent tire and rim damage, reversed

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