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post #1 of 17 (permalink) Old Jan 12th, 2006, 3:10 pm Thread Starter
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Question about appropriate tire size

It seems I've heard this issue discussed before, but don't remember all the details.

I am in the process of preparing an order with SW MOTO for a new set of Metzler Z-6's. Two sizes are designated for the rear. One size is 180/55 ZR 17, the other is 180/55 ZR 17 "B". Which one is the proper tire size, and what is the "B" designation all about?
A "B" designation is not listed for the front tire.

Thanks for your help.

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post #2 of 17 (permalink) Old Jan 12th, 2006, 3:50 pm
 
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The "B" is supposed to be a stiffer sidewall to handle the aditional weight of the mighty K. I have heard favorable reports from people using both the "B" and the regular Z6. Perhaps someone will weigh in with some more info on the need for the "B" rear tire.
What ever the reason is, I don't recall the front tire requiring the heavier "B" construction.
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post #3 of 17 (permalink) Old Jan 12th, 2006, 4:51 pm Thread Starter
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Thanks, Bob, for the response......

By the way, I sent my order for some Challenger Earplugs to you on Tuesday. Hopefully, the Challengers will cure my earplug problems (the generic ones I have will not stay in my ear).

Now, if I can just get some tires in life will be good.

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post #4 of 17 (permalink) Old Feb 12th, 2006, 5:31 pm
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Smile Metzeler B rated tires for 5.5 rear wheel only

Hi All
The 'B' rated tire is for the 5.5 inch rear wheel not the OEM 5.0 wheel. The 'B' compound is for the rear tire only and it is for heavier bikes like the K1200RS. This info is on the Metzler web site. I bought a new 5.5 wheel with the thought of up sizing but have since hesitated because I have heard that the wider tire makes turns more difficult! Not sure this is true but I need further research and discussions before I put the wider wheel on the bike. I'm chicken I guess.

Thanks
Robert

2014 R1200RT Ebony Black--(deep Burgundy)
2012 R1200RT Tri-Color (traded for 2014 R1200RT see above)
2012 R1200RT Tri-Color (Traded for exact same bike, see above)
2004 R1100SA "Piedmont Red Metallic" (Traded)
2002 K1200RS BLACK (Traded for RT)
2000 FLTRSEI "Screamin Eagle, Triple Red" Gone but not forgotten.
1999 FXR3 "Green Flame" In the Garage
1998 K1200RS "Taxi" (sold)
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post #5 of 17 (permalink) Old Feb 12th, 2006, 5:43 pm
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I was never able to find the load rating for the "B" version of the Z-6, but the non-B version has a load limit of 935 lbs. I suppose it's possible to exert more than the load limit on the rear if the bike is fully loaded (or you wheelie some distance with full gear and pillion). I've not had any issues with four tires of the non-B version on the back.



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post #6 of 17 (permalink) Old Feb 12th, 2006, 5:51 pm
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Smile Metzler 'B' compound rear tire for 5.5 wheel not 5.0 OEM wheel

The 'B' compound is for the 5.5 inch rear wheel not the OEM 5.0 inch rear wheel. I forget the additional lbs rating but if you have a K1200RS and have a 5.5 inch rear wheel you'd better have the 'B' compound rear tire per Metzler!
I printed all the Metzler specs for this very issue I speak the truth.

Thanks
Robert

2014 R1200RT Ebony Black--(deep Burgundy)
2012 R1200RT Tri-Color (traded for 2014 R1200RT see above)
2012 R1200RT Tri-Color (Traded for exact same bike, see above)
2004 R1100SA "Piedmont Red Metallic" (Traded)
2002 K1200RS BLACK (Traded for RT)
2000 FLTRSEI "Screamin Eagle, Triple Red" Gone but not forgotten.
1999 FXR3 "Green Flame" In the Garage
1998 K1200RS "Taxi" (sold)
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post #7 of 17 (permalink) Old Feb 12th, 2006, 6:58 pm
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Smile

http://www.us.metzelermoto.com/media...5_brochure.pdf
Regular 5.0 wheel 170/60ZR17 tire max load 783 lbs
Up Sized 5.5 wheel 180/55ZR17B ie 'B' compound tire 803 lbs
per Metzeler web site

Thanks
Robert

2014 R1200RT Ebony Black--(deep Burgundy)
2012 R1200RT Tri-Color (traded for 2014 R1200RT see above)
2012 R1200RT Tri-Color (Traded for exact same bike, see above)
2004 R1100SA "Piedmont Red Metallic" (Traded)
2002 K1200RS BLACK (Traded for RT)
2000 FLTRSEI "Screamin Eagle, Triple Red" Gone but not forgotten.
1999 FXR3 "Green Flame" In the Garage
1998 K1200RS "Taxi" (sold)
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post #8 of 17 (permalink) Old Feb 12th, 2006, 7:28 pm
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Hmmm...no difference in load-carrying capacity, but the 935 number isn't correct, either.


....................A....B.........C...D...E...F.. G..H...Z
180/55ZR17..(73W) R 5.50 5.50-6.00 178 630 805 42 186 6.6 12.76
180/55ZR17B (73W) R 5.50 5.50-6.00 178 630 805 42 186 6.6 12.80
180/55ZR17C (73W) R 5.50 5.50-6.00 178 630 805 42 186 6.6 14.00

(A) Measuring Rim: inches (B) Rims Permitted: inches (C) Max Width: mm
(D) Max Diameter: mm (E) Load Capacity: lbs (F) Max PSI: lbs (G) Max Speed: mph
(H) Tread Depth: mm (Z) Tire Weight: lbs








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post #9 of 17 (permalink) Old Feb 12th, 2006, 8:10 pm
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You're comparing all 5.5 inch wheels, ie no difference all 805 lbs, but the 5.0 wheel is as I stated 783 lbs. Don't know where the 9xx lbs number came from.

Thanks
Robert

2014 R1200RT Ebony Black--(deep Burgundy)
2012 R1200RT Tri-Color (traded for 2014 R1200RT see above)
2012 R1200RT Tri-Color (Traded for exact same bike, see above)
2004 R1100SA "Piedmont Red Metallic" (Traded)
2002 K1200RS BLACK (Traded for RT)
2000 FLTRSEI "Screamin Eagle, Triple Red" Gone but not forgotten.
1999 FXR3 "Green Flame" In the Garage
1998 K1200RS "Taxi" (sold)
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post #10 of 17 (permalink) Old Feb 12th, 2006, 8:24 pm
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The 935 number came from a Metzler sheet on the Z-6. That weight apparently has been decreased since the first publication. The "B" version is only available with the 180 tire, with emphasis from Metzeler that it was designed for heavier bikes like the BMW GT and LT. The original sheet didn't mention the RS, which is kind of odd, since the weight difference of both the RS and GT without bags is probably no more than 20 lbs. However, it's odd (to me anyway) that the "B" version is designed for heavier bikes w/o an increase in load-carrying capacity. The "B" version is a bit heavier, and the "C" version (first I've seen of a "C" version) weighs in a bit more.

The "B" version may have a stiffer sidewall, which would be helpful if the tire went flat, but the non-B version seemed to be quite stable when mine went flat. Felt a bit odd on curves at 70 MPH was all...

After two years and four sets of Z-6's, I'm convinced that they're a great tire, Metzeler spec sheets not withstanding. Next tires will probably be Continental R/A's.

When the Z-4's were available, both front and rear were available in "B" version as well as "K" version. Nobody at the BMW dealerships I spoke to had any idea why there were two different "specials" for the BMW bikes.



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