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Old 05-01-2008, 02:12 PM   #1 (permalink)
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I ordered a rear tire for my GL1800. The site said I could use a R60 or R70 which they called a high profile. I chose the R70, installed it and now I am told it is the wrong tire and is for the lighter Valkrie. I was told the weight rating is too low and the profile is too flat for the GL1800. The R70 is actually rated 70lbs heavier and has a more rounded profile. The local Honda service says it's the wrong tire... but we don't know why. Bridgstone doesn't answer e-mails. Does anyone really know the differecne in tires? Thanks Geo.
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Old 05-01-2008, 05:38 PM   #2 (permalink)
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The first thing is tires even of the same size can carry different sidewall ratings. So that will be stenciled on the tire somewhere. You do want a tire that has a pretty high load rating.

The 60/70 thing is where the profile(height of the sidewall) is 60 or 70 percent of the width of the tire. So actually the 70 is a bit taller.

What it can affect is the suspension and handling of the bike. A 60 tire is the correct size for the 1800. With that the suspension works with the tire. Will a 70 drastically alter that....do not think so it is not that much.....but I have found with the stock tire and setting the rear hydraulic shock at 15(that is my preference) it balances the bike and seat angle just right. If I were to go to a higher profile tire....then to get the correct seat angle I would have to lower the shock setting.....therefore creating too soft a ride.......

Hope this helps........check the side wall rating.....if it compares to 630/ 700 pounds or so the tire is not dangerous......but may effect the suspension. Kit
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The 1800 is my bike. The very best motorcycle ever made. I was enthralled with my first test ride on this machine. It is a great bike. A crotch rocket with storage bags.............As for oil I use the slick kind, and I like round tires, but as of late I have found square ones work best on the rear. Pirelli Eufori 195/55/16 @ 32 PSI
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Old 05-02-2008, 11:13 AM   #3 (permalink)
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"wrong tire" is relative to the factory recommendation, but given the load rating is equal or greater, I personally wouldn't worry about it unless there are other considerations (like bike warrenty).

The R70 tire will make the rear of the bike stand 1/2 taller(the tire is 1" taller) and the engine will turn about 4% slower for the same bike speed when compared to a R60 tire.... Unless someone gave me a better argument (than my own), I'd just wear it out, thenchooseanother or the oneI like better for the next one.. SDB/Jim
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Old 05-02-2008, 12:26 PM   #4 (permalink)
 
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Another good thing is ,it will be easier to get on the main stand
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Old 05-02-2008, 09:56 PM   #5 (permalink)
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As Wexman says it goes on the center stand easier and according to my GPS, itimproves the accuracy ofthe speedometer.
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Old 05-02-2008, 11:33 PM   #6 (permalink)
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jackjohn wrote:
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.... according to my GPS, itimproves the accuracy ofthe speedometer.
Interesting... not wanting to hijack the thread, but a quick question??? where is the speed sensor on an 1800???
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Old 05-03-2008, 04:36 AM   #7 (permalink)
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On an 2008 1800 the sensor is located on the output shaft, right side of engine, so the sensor works on the rpm of the output shaft. Kit
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The 1800 is my bike. The very best motorcycle ever made. I was enthralled with my first test ride on this machine. It is a great bike. A crotch rocket with storage bags.............As for oil I use the slick kind, and I like round tires, but as of late I have found square ones work best on the rear. Pirelli Eufori 195/55/16 @ 32 PSI
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Old 05-07-2008, 07:08 PM   #8 (permalink)
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Before finding this topic I posted one about using a 70 series instead of a 60 series. One of the comments here is about the weight rating. The original Dunlop D250 60 series is rated at 827 lbs. The original Bridgestone G704 60 series is also rated at 827 lbs. The Dunlop E3 70 series is rated at 910 lbs. I can't see why not use the 70 series!
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Old 05-07-2008, 09:31 PM   #9 (permalink)
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Regarding the R70 tire for the rear, this was suggested to me as my next replacement. The performance issues already mentioned here.

One odd issue that needs to be addressed for me is the ABS system reading on the oversized rear comparing it to the standard size front tire. Is there a braking problem here? The rear will be turning slightly slower due to its increased size.

Anyone have any experience yet?

Thanks Longboater,


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Old 05-07-2008, 10:04 PM   #10 (permalink)
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I would think......not that I really know.....but a bike is designed to certain specs. When you go changing one thing it affects another. It would seem to me if you have an ABS model messing with the tire size would not be a very good idea. The ABS system is quite dependent upon tire rotation and speed to have both front and rear brakes to work together. Could very well mess with the computer or printed circuit board that controls the ABS system......they say nothing is truly yours until you have messed with it.....but I think in this case, best to not. Kit
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The 1800 is my bike. The very best motorcycle ever made. I was enthralled with my first test ride on this machine. It is a great bike. A crotch rocket with storage bags.............As for oil I use the slick kind, and I like round tires, but as of late I have found square ones work best on the rear. Pirelli Eufori 195/55/16 @ 32 PSI
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