Tire size mismatch and the anti-skid system - Kawasaki Versys Forum
 
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post #1 of 5 (permalink) Old 11-09-2019, 09:57 AM Thread Starter
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Tire size mismatch and the anti-skid system

Does the anti-skid system (2015 V650) fault if the tires are mismatched? Specifically, if a slightly larger or smaller size is used, does the anti-skid still work properly?

For example, going to a 130/80-17 front tire results in a +6% difference in circumference compared to the correct 120/70-17, and so the front wheel is turning 6% slower.
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post #2 of 5 (permalink) Old 11-09-2019, 10:52 AM
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Im no expert on exactly how the system measures or compares wheel speeds, but I dont think it would render the ABS system useless or even fault it. I assume it knows when one particular wheel is approaching the threshold of lock-up based on that wheels sensor alone. That assumption is based on doing burnouts on different ABS equipped bikes* and not having the rear brake's ABS try to slow that wheel down. So I dont think a basic ABS system like ours compares wheel speeds. *they were older BMWs, no burnouts on the Versys yet

There are multiple posts on the forum of guys running different and non-OEM sized tires on ABS bikes with no issue. Mostly Shinko 705s, which tire are you putting on the front?

If we had traction control or a linked ABS system it might be a different story.

2016 Versys 650LT - Madstad, T-Bob, LeoVince, SeatConcepts, HyperPro CSC Damper, Shoodabeen Flashed
2003 KLR 685 - +1mm IN & EX SS valves P&P, Innovate Wideband O2 Sensor, Progressive 465 w/ RAP, ThermoBob
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post #3 of 5 (permalink) Old 11-09-2019, 12:11 PM Thread Starter
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Originally Posted by asphaltaddict33 View Post
Mostly Shinko 705s, which tire are you putting on the front?
Our ABS can be disabled by doing a burnout with the front wheel locked. This is a way to disable it when going off-road. Put the rear wheel on dirt or grass, hold the front brake, and let the rear wheel spin a bit.

But other than that major differential in wheel speed I don't really know how our ABS computer thinks.

I am looking at possibly Shinko 705's or Michelin Anakee or possibly a Turkish made winter tire called Anlas. For winter cold weather riding I would like to have a softer rubber compound plus good tread for contaminated surfaces (sand, gravel, or even the surprise small patch of snow).

There are a lot of good tires not available in exactly original V650 sizes.

For summer use I run Pirelli Scorpion Trail II in original size. They are an excellent tire but they don't seem to warm up even on the highway in temps below 40F.

Last edited by Fly-Sig; 11-09-2019 at 12:14 PM.
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post #4 of 5 (permalink) Old 11-09-2019, 02:08 PM
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Interesting, good to know that burnout hack for our ABS. Ive got no good advice on the different tire sizes and ABS then

I felt much more confident in our colder shoulder seasons on Avon Trailriders when I ran them. M+S rated and deep lugs for road debris and water, they also did well on hard packed snow around my garage and side streets. Current Pirelli Angel ST doesnt warm up quite the same

2016 Versys 650LT - Madstad, T-Bob, LeoVince, SeatConcepts, HyperPro CSC Damper, Shoodabeen Flashed
2003 KLR 685 - +1mm IN & EX SS valves P&P, Innovate Wideband O2 Sensor, Progressive 465 w/ RAP, ThermoBob
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post #5 of 5 (permalink) Old 11-10-2019, 06:10 AM
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Originally Posted by Fly-Sig View Post
Our ABS can be disabled by doing a burnout with the front wheel locked. This is a way to disable it when going off-road. Put the rear wheel on dirt or grass, hold the front brake, and let the rear wheel spin a bit.
I've done it in 2nd gear. I didn't check if it can be done in 1st gear.
It might requires a minimum speed or 2nd gear.
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