Quote:
Originally Posted by ROBERTSUNRUS
...I was going to buy a set for my tow vehicle and my wife's car [BMW X-3] but Centramatics aren't made for the BMW. So Dyna beads might be the choice for her car.
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there may be issues using beads OR c'matics on the bimmer...
for trailer applications where the RIM offset is zero, the plate is pretty close to center line and balancing is reasonably 'centered'
but for ANY rim with much offset the plate will be OFF center and so too the balance.
for wide/low profile or even mildly PERFORMANCE tires/wheels this will be an issue.
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putting beads inside low aspect tires might be a problem too.
since they would need to spread laterally as well as longitudinally to help with balance.
that is the only issue with the DRIVE tires, but what about the STEERING tires?
every bit of steering input will result in a shift of beads...
and again for low profile/wide tires and rims with significant OFFSET this is an issue.
i also have concerns about how beads MIGHT alter tire temps and pressures....
with LOTs of stop/go/stop/GOGO/turn/go/stop/go, the beads will be FLYING around inside the tire heating UP the air and water inside...
that continuous CHANGE in grip/acceleration/turns/stops isn't happening in MOST trailer tires.
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trailer tires aren't at the vehicle corners and aren't subject to slip angle forces or rotation around an axis is 2 directions...
on motorbikes the tires have a ROUNDED profile and the wheels typically ZERO offset,
and bikers TILT the tires when cornering, so beads shifting isn't an issue....
same with big rigs.
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does the bimmer have INTERNAL tpms?
i would not want beads MUCKING up the valve stems/sensors that are INTERNALLY located by OEM vehicle makers.
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it's important to keep IN PERSPECTIVE why we are using continuous balancing on trayla tires....
1. rotating trailer tires isn't easy
2. many shops cannot CORRECTLY balance trailer rims (lug centric vs hub centric)
3. trailer tires tend to SIT more so flat spotting is an issue as is HIGHER air pressures associated with towing...
4. SOME OLD TRAILERS may have extremely OUT of balance hubs...
4.1. but i don't not believe there is MUCH (or any) evidence for this issue in newer hubs...
OR disc brake running gear.
((where is the proof/evidence/data on HOW MUCH out of balance newer hubs really are?))
5, so using beads OR plates ADDs to or IMPROVEs on the balancing of trailer tires/wheels...
6. it is NOT a substitute for having them properly balance when tires are initially MOUNTED...
7. in my view they prolong that original balance and offset minor changes associated with tire wear.
8. but they are NOT a panacea for all tires on all rims on all vehicles.
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i would be especially careful about using EITHER on low profile tires/rims or on SPORTY cars where steering matters...
OR on rims with significant (any) + or - offset.
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for a SINGLE axle 'stream, consider liquid LATEX tire sealants...
not only do these products fill small leaks and offer protection for nails/screws and so on....
the LIQUID moves and offers some of the SAME balancing dynamics of BEADS...
cheers
2air'