Techie Question -- Tire/Wheel Combos


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kerrsys
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Techie Question -- Tire/Wheel Combos

Postby kerrsys » Thu Dec 29, 2011 11:14 am



Got a technical tire/wheel question for you:

My Roadsmith rig is a 2010 GL1800 under the covers. The current wheels are your stock design --16x7, 5X4.5 with 35 mm offset. Running the standard Kumho Solus tires at 205/65/R16. Standard Dunlop Front Tire/Wheel.

Here are my Two Questions:

1) Will the trike handle differently and do I introduce any risks or fit problems going to the following wheel / tire combo:

Wheels: 16x7, 5X4.5 with 40 or 42 mm offset
Tires: 215/65 or 70 /R16

2) Do you have any thoughts (pro/con) on running a rear motorcycle tire on the front, installed backwards? I'm reading that many people swear by it with stories of improved handling and tire mileage.

Would like your insight before I start to change the set-up.

Thanks!



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RoadRogue
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Re: Techie Question -- Tire/Wheel Combos

Postby RoadRogue » Thu Dec 29, 2011 8:49 pm

Rear tires run backwards on the front is a common practice. the reason is that generally a rear M/C tire has thicker tread than the same brand M/C front tire,and therefore should last longer.Running it backwards is because of the way it is constructed,belt overlaps are designed to take the stress of hard acceleration. There is much less stress on the rear tire as alot of weight gets transfered to the front wheel when braking.On the front you want to take advantage of this stronger direction because there is now increased stress in the braking direction of rotation,and very little in the acceleration rotation. I hope thats clear enough

As for the other end of the trike ,I cant help you there. you have one too many wheels for my taste.So far.........
Ride safe, Todd
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trike lady
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Re: Techie Question -- Tire/Wheel Combos

Postby trike lady » Thu Dec 29, 2011 11:02 pm

Here's a chart to help you with the offset issue. Clearance may be the issue with your kit and that is why that specific offset was selected. The best bet would be to contact the manufacturer of the conversion and ask what the +/- for offset is they can suggest. Too far in or out and it could rub on the trike fender.

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themainviking
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Re: Techie Question -- Tire/Wheel Combos

Postby themainviking » Fri Dec 30, 2011 6:41 am

Yeah, front would be fine. The only problem you would run into going the direction in your plan is if the fenders of the trike body rubbed on the tires. If you have the clearance, you would be fine there too.
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cbx4evr
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Re: Techie Question -- Tire/Wheel Combos

Postby cbx4evr » Fri Dec 30, 2011 8:18 pm

kerrsys wrote:Got a technical tire/wheel question for you:

My Roadsmith rig is a 2010 GL1800 under the covers. The current wheels are your stock design --16x7, 5X4.5 with 35 mm offset. Running the standard Kumho Solus tires at 205/65/R16. Standard Dunlop Front Tire/Wheel.

Here are my Two Questions:

1) Will the trike handle differently and do I introduce any risks or fit problems going to the following wheel / tire combo:

Wheels: 16x7, 5X4.5 with 40 or 42 mm offset
Tires: 215/65 or 70 /R16


You probably wouldn't introduce any risks changing tires as long as the clearances are there. You may notice some handling/ride differences because in both case you are increasing the sidewall dimension. Not sure about the speedo on an 1800 or a trike for that matter. if it's on the front wheel it won't matter.

What are you actually trying to achieve by changing sizes??

Tire size:

Original tire
Sidewall: 5.25 in
Radius: 13.25 in
Diameter: 26.49 in
Circumf: 83.23 in
Revs/mile: 761.29

New Tire - 215/65/16
Sidewall: 5.50 in
Radius: 13.50 in
Diameter: 27.00 in
Circumf: 84.84 in
Revs/mile: 746.86

This tire will be 1/2" taller than the original.

New Tire - 215/70/16
Sidewall: 5.93 in
Radius: 13.93 in
Diameter: 27.85 in
Circumf: 87.49 in
Revs/mile: 724.16

This tire will be 1.36" taller than the original.


On the offset question:

Increasing the offset to 40 or 42 will move the back of the tire/rim in 5 or 7mm respectively. Shouldn't be a problem but again clearances need to be checked.

Attached some files with drawings.

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kerrsys
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Re: Techie Question -- Tire/Wheel Combos

Postby kerrsys » Sat Dec 31, 2011 10:16 am

cbx4evr...Great info, thank you.

The idea about the tire size change was related to being consistent with recommended tire size for the wheels that I'm looking to purchase. The decision to move to a different wheel is simply aesthetics. But, I'm not sure that a minor increase in offset (the only difference between the new and old wheels) is enough to warrant upsizing the tire, too.

Btw -- Any thoughts on that last point would be appreciated.

Also, do you think I would need to install a spacer to adjust for the 5/7 mm offset increase?

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Re: Techie Question -- Tire/Wheel Combos

Postby cbx4evr » Sat Dec 31, 2011 6:18 pm

kerrsys wrote:I'm not sure that a minor increase in offset (the only difference between the new and old wheels) is enough to warrant upsizing the tire, too.

Btw -- Any thoughts on that last point would be appreciated.

Also, do you think I would need to install a spacer to adjust for the 5/7 mm offset increase?



I would say that staying with your original tire size of 205/65/R16 with the new rims will not cause you any issues. Like you said the only difference is the offset of the wheel and going to a 40 or 42 shouldn't be a problem either. It's about 1/4" and I would think that you have that kind of room without a need for spacers.


"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "


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