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Old 09-15-2011, 01:44 PM   #61
Schtum
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Quote:
Originally Posted by macrae85 View Post
Same with ABS.An ABS system lets off the brakes when the 'ring' stops moving,doesnt
matter what size of rim that's on there.
Sorry Mac but I think you'll find this is incorrect. The computer takes into account the difference in rotation speeds between the front and rear wheels and uses this information to make decisions about ABS operation. So if you fit different sized wheels you have to re-program the ECU to take account of this, otherwise you bugger up the ABS operation.
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Old 09-15-2011, 04:18 PM   #62
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Quote:
Originally Posted by Schtum View Post
Sorry Mac but I think you'll find this is incorrect. The computer takes into account the difference in rotation speeds between the front and rear wheels and uses this information to make decisions about ABS operation. So if you fit different sized wheels you have to re-program the ECU to take account of this, otherwise you bugger up the ABS operation.
Not sure where I read it... but one of the BMW techs around here said that when you first start moving, it is sort of an ABS calibration period. At this time, it figures the difference in wheel speeds for different size wheels. Also, several people have done wheel size conversions without reprogramming anything and did not have any adverse effects.
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Old 09-15-2011, 04:36 PM   #63
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Not sure where I read it... but one of the BMW techs around here said that when you first start moving, it is sort of an ABS calibration period. At this time, it figures the difference in wheel speeds for different size wheels. Also, several people have done wheel size conversions without reprogramming anything and did not have any adverse effects.
If that's correct then that's great and it might be that's why it takes a couple of wheel revolutions before the Brake Failure light extinguishes each time you fire up the bike and ride off. However, I think it's as well to know that and the fact that the ABS begins to take effect long before the wheels lock up.
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Old 09-15-2011, 08:29 PM   #64
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Originally Posted by Schtum View Post
If that's correct then that's great and it might be that's why it takes a couple of wheel revolutions before the Brake Failure light extinguishes each time you fire up the bike and ride off. However, I think it's as well to know that and the fact that the ABS begins to take effect long before the wheels lock up.
true, it does measure a difference in wheel speeds. This is why the ABS does not work if one sensor is missing or broken..
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Old 09-18-2011, 12:45 AM   #65
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On the ABS..

What I did was to order a new ABS rotor, for 17" front wheel, with the new wheel and it works flawlessly.

I have only one regret with this new wheel. I should have done it two years ago.
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Old 09-26-2011, 12:53 AM   #66
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Question ABS Ring

Steffo

Where did you get the new ABS ring from? With the original one the ABS switches off after hitting 30.
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Old 10-24-2011, 12:23 AM   #67
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Just for completeness

as search engines often come up with unfinished queries

I have come across a Wunderlich part for the old F650GS single, http://www.wunderlichamerica.com/mot...e/8160576.html which is the ABS ring for their 17" conversion for the single,and as this has the same PCD it should solve the problem.

Tried this and it works.
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Old 10-02-2012, 12:21 AM   #68
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So, apologies if reviving an old thread is a crime but I have read many many threads, on many forums trying to resolve this issue.

It would appear, you CAN, fit a 17 inch wheel to the front, as long as you use the wunderlich part for the abs ring. Correct?

As an alternative, has anyone made the F800R front wheel fit the f800gs yet?
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Old 11-08-2012, 09:20 PM   #69
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Old 05-27-2013, 03:30 PM   #70
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did u do it?
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Old 05-28-2013, 08:46 AM   #71
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did u do it?


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Old 06-11-2013, 12:45 PM   #72
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wow, a beast! where is the front system from?
nice work man
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Old 06-11-2013, 01:49 PM   #73
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wow, a beast! where is the front system from?
nice work man
it is a WP ktm front end with a ktm SM wheel
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Old 06-16-2013, 03:21 PM   #74
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it is a WP ktm front end with a ktm SM wheel
sorry for repeating the question, but which KTMs front end was that? do you still have ABS?

thanks a lot
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Old 11-29-2013, 01:50 AM   #75
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Don't knock it 'til you try it !

I decided to see if I could have 2 bikes in 1.
I got sick of changing between road and dirt tyres depending on who I was riding with, so the obvious solution was 2 sets of wheels with tyres and brakes ready for quick swaps.
Even better, how about tubeless 17" super sticky road rubber to really mess with the sports bikes .
For playing in the dirt it looks like this -


And here's what it looks like with a 120/70-17 on a 3.5" front and 180/55-17 on a 5.5" rear ready for the street -


Uses custom lasercut ABS rings to keep the speedo correct and the ABS happy.
Changeover is pretty quick if I don't remove the pannier racks, bash plate toolbox, etc. Simply pull axles, swap wheels, drop rear preload, add 1/2 turn rear damping, add 4 clicks front compression and 4 clicks front rebound damping.
Turns like a sports bike. Sports bike wheels are light too.
Probably need a lower front guard to complete the look but that's just another time adder when changing over.

I doubt this will be one of a kind for long, I already have 3 mates with F8s (all serious dirt riders) who want me to do a set of 'tards for them too.

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