ABS wheel bearings for lager wheels, 21"+
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From: Switzerland
ABS wheel bearings for lager wheels, 21"+
Hello,
can anyone explain to me the actual differences in ABS wheel bearings made for wheels of larger sizes? Like these sold by Arlen Ness. They have them for "factory", 21, 23 and 26".
I can attest, there is a point to it, as I used to run a "factory" Arlen Ness one, in an (incidentally) stock wheel of 21" size and the ABS would activate way before the front tire would lock. I subsequently replaced it with a OEM ABS bearing and all was fine. But I could never quite solve this riddle...
Another question I have, is about the shelf life / storage of bearings. SKF claims three years is the max, relating it mainly to the deterioration of the bearings' lubricants and corrosion. So if I remove the seals of an older (but unused) bearing, clean it out, re-lube it and make sure there is no corrosion, I am good to go?
Thanks a lot, niv
p.s. I am counting on your encyclopedic knowledge, @multihdrdr
can anyone explain to me the actual differences in ABS wheel bearings made for wheels of larger sizes? Like these sold by Arlen Ness. They have them for "factory", 21, 23 and 26".
I can attest, there is a point to it, as I used to run a "factory" Arlen Ness one, in an (incidentally) stock wheel of 21" size and the ABS would activate way before the front tire would lock. I subsequently replaced it with a OEM ABS bearing and all was fine. But I could never quite solve this riddle...
Another question I have, is about the shelf life / storage of bearings. SKF claims three years is the max, relating it mainly to the deterioration of the bearings' lubricants and corrosion. So if I remove the seals of an older (but unused) bearing, clean it out, re-lube it and make sure there is no corrosion, I am good to go?
Thanks a lot, niv
p.s. I am counting on your encyclopedic knowledge, @multihdrdr
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Joined: Oct 2011
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From: Nor Cal
I can only speculate on the ABS bearing ... that there are different number of Poles on the magnetic encoder ring because of the change in speed after wheel Diameter change.
Search for an ABS bearing magnetic field finder
As to Corrosion ... at the start, it can't be seen by the naked eye
.
Search for an ABS bearing magnetic field finder
As to Corrosion ... at the start, it can't be seen by the naked eye
.
Last edited by multihdrdr; Mar 7, 2022 at 09:22 AM.
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Tourer
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From: Switzerland
Thanks @multihdrdr! I was thinking something similar, and that would lead me to believe that the ones for larger wheels should be downwards compatible in terms of sizing. I may be able to get a hand on one for a 26 wheel, would be tempted to experiment on the 16 rear wheel of my Softail 😬 lets see
best, niv
best, niv
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it is all in the abs programming.
a higher count refines the operation of the system but that does not mean a lower count cannot be used, the abs needs to be calibrated. a straight up abs, looks at wheel speed and they must match within in a window. now if you kick in low tire indication, it matters a lot so a higher count in needed and all wheels must match.
most mfg's for liability reasons put date life recommendations. they do not know how they will be handled or stored. aviation industry is a perfect example of requiring date life. i have thrown many new parts away because faa requires it.
a higher count refines the operation of the system but that does not mean a lower count cannot be used, the abs needs to be calibrated. a straight up abs, looks at wheel speed and they must match within in a window. now if you kick in low tire indication, it matters a lot so a higher count in needed and all wheels must match.
most mfg's for liability reasons put date life recommendations. they do not know how they will be handled or stored. aviation industry is a perfect example of requiring date life. i have thrown many new parts away because faa requires it.
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From: Switzerland
Hey @bustert , I am not sure I fully understand what you are saying, other than "make sure your bearings are not too old". And even that I may be misunderstanding...
I remember having freshly installed a aftermarket ABS bearing (not specified for any particular wheel size) in my front 21" wheel and the ABS would activate rather quickly, way before the front wheel was about to lock up. this came with the upgrade to dual brakes (touring brembos) on a 21x2.15 wheel, so at first I was concerned that the improved braking power really lead to the wheels locking up with even a medium braking effort.
Once I replaced the bearing with an OEM ABS one, everything worked just fine. I can't tell for sure that the aftermarket bearing was not faulty, but I do have the suspicion that it would not satisfy the requirements of a 21" wheel, as the manufacturer sells separate bearings for 21", 23" and 26" wheels.
Hence my interest in trying out a 26" ABS bearing on a much smaller wheel to check for downwards compatibility.
I have thrown out the non-functioning aftermarket bearing, so no way to tell now what the reason was for the early engagement of the ABS.
Best, niv
I remember having freshly installed a aftermarket ABS bearing (not specified for any particular wheel size) in my front 21" wheel and the ABS would activate rather quickly, way before the front wheel was about to lock up. this came with the upgrade to dual brakes (touring brembos) on a 21x2.15 wheel, so at first I was concerned that the improved braking power really lead to the wheels locking up with even a medium braking effort.
Once I replaced the bearing with an OEM ABS one, everything worked just fine. I can't tell for sure that the aftermarket bearing was not faulty, but I do have the suspicion that it would not satisfy the requirements of a 21" wheel, as the manufacturer sells separate bearings for 21", 23" and 26" wheels.
Hence my interest in trying out a 26" ABS bearing on a much smaller wheel to check for downwards compatibility.
I have thrown out the non-functioning aftermarket bearing, so no way to tell now what the reason was for the early engagement of the ABS.
Best, niv
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well, the abs should activate before wheel lockup, it is futile not to do so since a stalled wheel has no steering.
the more counts you have, the more refined the system is, for grins and giggle, 4 counts per revolution vs 8.
it is like a dot matrix printer, the higher the resolution the crispier the image.
now take a 16 wheel and a 21 wheel, at the sensor it reads the revolution of the bearing by counting the reluctor pulses it does not care how far the wheel has traveled, aka, one revolution is one revolution.
that does not mean wheel size is not important because we do know that it effects many aspects of the machine's handling.
the more counts you have, the more refined the system is, for grins and giggle, 4 counts per revolution vs 8.
it is like a dot matrix printer, the higher the resolution the crispier the image.
now take a 16 wheel and a 21 wheel, at the sensor it reads the revolution of the bearing by counting the reluctor pulses it does not care how far the wheel has traveled, aka, one revolution is one revolution.
that does not mean wheel size is not important because we do know that it effects many aspects of the machine's handling.
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