K1200LT auto rear wheel conversion - BMW Luxury Touring Community
 
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post #1 of 11 Old Nov 26th, 2009, 9:28 pm Thread Starter
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K1200LT auto rear wheel conversion

Not wishing to reinvent the wheel has anyone done a "car tire/ wheel" conversion without using a welded or riveted/bolted/ hub/wheel unit on the K1200LT like my 1999 K1200LT? My rig has a Hannigan KLT sidecar attached.

Does anyone know what the oem rim "offset" and "backspacing" is and the specs on the 4/5 lug bolts of the K1200LT 5.00 -17 rear wheel?

Have you found a 15" rim that can be converted if necessary with a spacer/ adapter plate off the shelf or custom fab'd?

There are a couple of 15" auto tires that either would do nicely for diameter and cost 100 dollars vs the now astronomical price for a rear 880 m/c tire.

TIA !

Carl

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K1100LT w/ ECC
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post #2 of 11 Old Nov 27th, 2009, 12:45 am
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Re: K1200LT auto rear wheel conversion

I don't know of anyone that's done that on an LT (except maybe the sidecar folks like Hannigan, etc.). But I do know several 'Wing and FJR riders that have successfully run car tires. The FJR even has a 17" rear rim, which means a Potenza 205/50-17 car tire fits onto the stock rim and has approximately the same overall circumference.

On the LT, I would be worried about clearance against the single-sided swing arm right up at the corner edge of the tread, where a car tire is more squared off and a bike tire is more rounded. The LT's swing arm comes in rather close there so you might have to offset the LT's rim a bit in order to get the correct clearance.

You can also get a 195/45-17 car tire, but it will have a noticeably smaller circumference resulting in higher RPMs for a given speed and correspondingly worse fuel mileage. Plus I hear the 205/50 tire is a bear to get onto the bike rim (it doesn't have as deep of a center well as a car rim), but the 195/45 tire is damn near impossible to get onto a bike rim.

If you're serious about this, I can hook you up with a few Dark Siders (those who are running car tires) and I'm sure they could give you more info.

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post #3 of 11 Old Nov 27th, 2009, 10:21 pm Thread Starter
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Re: K1200LT auto rear wheel conversion

Ken,
Oh yes! There is just not much room up in the K1200LT rear wheel well. Maybe 13 or 14 mm of space past the rear of the para-lever arm and not much more over on the left side before rubbing on the left side case luggage.
I was thinking the "wheel off-set" and "backspace" might be found somewhere but short of measuring it as I have done the necessary "exact" data seems elusive.

Going with the existing 5" by 17" oem rim and the Portenza 195/45 17 would bring up a greater rpm change that I would want and the 205 would be just too much profile right were it wouldn't be wanted. Both of these small number profiles bring on the diameter matching problem as you indicated........ gets real hard to mount/dismount them.

Right now I would opt for the Goodrich TA in 155/80- 15 if I could get a 4 bolt 5 by 15" alloy rim and the necessary adapter made to shim out the negative "offset" of the oem wheel and convert from the miniscule 4 bolt diameter of the oem hub to the larger 100mm bolt pattern of the 4 bolt USA rim. The new rim has to occupy the exact same space as the old oem or it will not work as you know.

I do appreciate your help!

Carl

K1200LT w/ KLT s/c
K1100LT w/ ECC
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post #4 of 11 Old Dec 5th, 2009, 10:24 pm
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Re: K1200LT auto rear wheel conversion

Tourdog, I have a car wheel conversion on my LT with Hanningan LT sidecar. Purchased from CStanley Motorsports in Pa. $700 for wheel and adapter. Pricey but does job. Started out with a B F Goodrich 155/80/15 tire but changed to a 165/80/15 tire. Did not like the handling. I would sell the BFG tire. Hope this helps. Mike Richard, Rock Island, Il.
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post #5 of 11 Old Dec 6th, 2009, 10:05 pm Thread Starter
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Re: K1200LT auto rear wheel conversion

Mike,
Was the poor handling of your rig due to the smaller diameter of the 155/80-15? It seems that tire has about a 24.7" dia. vs say a 160/70-17 Bridgestone 020 at about 25.7" (mine is down to 25.5" dia with about 5,000 miles on that rear tire). The 165/80-15 you now have would put the K12LT up about same as an oem B. Stone I think and give you same or similar to oem handling? Or, was it the different tread etc?

You must be the person that Dave Keesee (great guy) mentioned when I was at Murray who has the KLT from western Illinois?

Carl

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post #6 of 11 Old Dec 7th, 2009, 9:00 pm
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Re: K1200LT auto rear wheel conversion

Carl, on the BFG tire is slightly smaller diameter and more square on the treadedge. The 165/80/15 Kumho tire diameter is same as the Metzler tire that was the bike when the sidecar was installed. The Kumho tire tread edge is rounder than the BFG tire. I preferred the handling of the rig with the Kumho tire over the BFG. I think the BFG tire lowered the rear of the bike. Yes I must be the one Dave mentioned. I do think the money for the wheel and adapter plate was money well spent. Mike Richard
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post #7 of 11 Old Dec 8th, 2009, 8:38 am
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Re: K1200LT auto rear wheel conversion

It appears that there just may be several choices for a car tire that fits the LT's rear end at 165/80/15

There's the 118 mph T-rated Kumho Power Sport talked about above (with picture and specs below) at around $45.00, and:

2. Cooper Trendsetter SE (junk) speed rated S or 112 mph.

3. Dunlop SP20 T rated at 118 mph. $46.00

4. Firestone FR860?

5. Pirelli P400 T rated. $38.00

I don't think it would be difficult to find a nice looking mag wheel, so all that remains is for some brave sole to fab up an adapter plate on their home lathe and sell them to all of us for $100.00. Let's see, about 10,000 LT's out there... I'll even buy the lathe for a 50% stake in the profits.

At one fifth the cost of a Metzeler with a close to 1200 lb. load rating - and if you do most of your riding on the straights pulling a trailer - the Pirelli would be VERY attractive to me. I would not be surprised to see 30K out of it. If you figure the average Metz goes 10K miles you are paying .02 cents per mile vs. .0012 cents per mile for the Pirelli....

I've also listed the Metz specs below in the third frame...
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Last edited by RonKMiller; Dec 8th, 2009 at 10:19 am.
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post #8 of 11 Old Dec 8th, 2009, 3:13 pm Thread Starter
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Re: K1200LT auto rear wheel conversion

Mike & Ron,
Thanks for adding to the info on this endeavor.

Does anybody have a link on the " lug bolt circle diameter " of the oem Beemer K1200LT rear hub on the Final Drive ? No, it is not good enough to measure off the oem rear wheel or use the 2mm thick spacer! I never thought something so simple could be the hardest to find ?! (roughly, it is close to 69 mm)

It is probably hidden somewhere in our "VAST" collections of K1200LT data ......................

Carl

K1200LT w/ KLT s/c
K1100LT w/ ECC
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post #9 of 11 Old Dec 20th, 2009, 12:13 am
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Re: K1200LT auto rear wheel conversion

Here is a picture (looking up) of a Bridgestone Bias and how close it is to the swing arm - 13 to 14 mm maybe the clearance for the side wall but the tire clearance at 45 degress is where the problem is! And yes I have the spacer installed on my wheel

So any adapter may need to move the tire away from the swing arm . . . especially if it has a square profile.




Here is a picture of the Bridgestone Radial that delaminated and hit the same swingarm


Dan Finazzo
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post #10 of 11 Old Feb 26th, 2010, 9:05 pm
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Re: K1200LT auto rear wheel conversion

Ron, you can count on my $100 for sure! You estimated 10,000 LT's out there but you forget the 69.43% who know for absolute fact that if you put a car tire on a motorcycle you wont even get the bike shifted from neutral to 1st gear before it's upside down in the ditch. They've never tried it but it is the absolute truth! Car tire? Fire up the engine and she's in the ditch. F'n C/S morons!

Loren

Quote:
Originally Posted by RonKMiller
It appears that there just may be several choices for a car tire that fits the LT's rear end at 165/80/15

There's the 118 mph T-rated Kumho Power Sport talked about above (with picture and specs below) at around $45.00, and:

2. Cooper Trendsetter SE (junk) speed rated S or 112 mph.

3. Dunlop SP20 T rated at 118 mph. $46.00

4. Firestone FR860?

5. Pirelli P400 T rated. $38.00

I don't think it would be difficult to find a nice looking mag wheel, so all that remains is for some brave sole to fab up an adapter plate on their home lathe and sell them to all of us for $100.00. Let's see, about 10,000 LT's out there... I'll even buy the lathe for a 50% stake in the profits.

At one fifth the cost of a Metzeler with a close to 1200 lb. load rating - and if you do most of your riding on the straights pulling a trailer - the Pirelli would be VERY attractive to me. I would not be surprised to see 30K out of it. If you figure the average Metz goes 10K miles you are paying .02 cents per mile vs. .0012 cents per mile for the Pirelli....

I've also listed the Metz specs below in the third frame...

WAK1200LT
Loren

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post #11 of 11 Old Feb 26th, 2010, 10:37 pm
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Re: K1200LT auto rear wheel conversion

http://www.youtube.com/watch?v=tozvjE6rzhw

http://www.bmwlt.com/forums/showthre...ight=Dark+Side

Just search and I know there are more threads...

Hoss
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