| a test swap them and see what vibs result. I do not know if the wider rears will cause problems in the front but you can determine that when you swap before the drive. If the vibs are the same maybe can rule out tire balance although I have done a swap like this with same vib and it turned out the tires were out of balance. Some of the tire shops do good work on balance but most rush to quick and give you a 90% there job. As en5 suggests a bent rim, I add check all rim tire bead inner and outer edges for lateral and radial runout. Easy DIY job with tire off ground. Lateral max rim runout generally not to exceed 1/32" and radial rim runout not to exceed 1/16" Preferably less than these - zero best. Note that the rims could be true but the tires have lateral tread runout and radial out of round. If that is the case might ask them to replace the tires or try rim matching to get the least runout. Rim match by finding the factory dot on the rim for the low point of rim tire bead edge and matching the high point of the tire there. If factory rim dot not there the low point can be measured for each edge of the rim and select the average position between them for each rim. Performance tires come with a colored dot and sometimes an additional colored triangle, The dot is for harmonic match mounting and should be placed at the rim low point dot. If that not available 2nd best is to place the colored triangle on the tire if available at the valve stem location. If you go thru all of this and you still have the vib problem you probably have eliminated the tires. I went thru this procedure with a stubborn set of Dumblops only to find out in the end the tire shop was using there balance machine incorrectly. But when I was done I had a really smooth ride with matched rim and tires. When ever I put tires on I always match mount. Incedently rim low points change with age and use so they need to be checked to relocate. The smooth ride is worth the effort.
ZUL8TR in Orlando,FL |
