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Old 08-12-2015, 02:11 AM   #1 (permalink)
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low rolling resistance tyre

hi im currently ongoing a project on building a 4 wheeler based on a gy6 80cc engine.
im currently finding low resistance bike tyre. can you guys recommend any good tyres with low resistance? 17inch in size
and
the gy6 80cc engine which fairly the same as ruckus engine.
any ideas on how to improve the mpg. im currently ordering carb to efi conversion kit so i can manualy tune it.

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Old 08-12-2015, 09:02 AM   #2 (permalink)
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I am going to guess you are using the wheels from a motor scooter rather than a car - and this makes a MAJOR difference.

17" car tires are completely different than 17" scooter/motorcycle tires. They operate on different principles, not to mention they come in completely different sizing.

So assuming that is true, then you'll want to be sure you have enough tire to carry the load. While it may appear that double the number of tires from a scooter to a 4 wheeler would be adequate, remember you are adding structure, so the weight will be more - and you will need a larger tire.

And for fuel economy, you'll want the largest tire you can find that fits the wheel (don't forget the the width of the wheel is important.)
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Old 08-12-2015, 09:57 AM   #3 (permalink)
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yes im going to use a motorcycle wheels. the requirement stated that i need to use min of 80mm width of tyre with 17inch dia minimum. so im planning to use 17 x 1.6 wheels. with 80/90/17 tyres. so now im just finding which motorcyle tyre that have a low rolling resistance. from googling i can only find low resistance car tyre.
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Old 08-12-2015, 10:09 AM   #4 (permalink)
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Keep in-mind that a motorcycle wheel is not designed to take the lateral loads like an auto wheel. Using a motorcycle wheel on the front of a 4-wheel vehicle may cause it to fail.
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Old 08-12-2015, 11:36 AM   #5 (permalink)
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A motorcycle never rolls the sidewall like a car does. That said, I doubt you are trying to build an autocross car so it will probably hold up fine for an ecomodder car where the goal is best possible fuel economy.
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Old 08-12-2015, 12:13 PM   #6 (permalink)
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actually is a car for an eco marathon competition thats why i asked this question on ecomodder forum.
the objective is to complete 10laps of 12km under 29minutes.there would be a stops for each laps to simulate town driving. max driving speed would probably be around 30-40kmh.
so any ideas?
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Old 08-12-2015, 02:23 PM   #7 (permalink)
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Why not go 3-wheel?

My son and I built an electric race kart (4-wheel) for a competition where some of the entrants were using bicycle wheels on the front of their 3-wheelers. Numerous vehicles folded the wheels under when cornering - and they were not going fast at all - like 15 MPH (we had a slightly different plan, and hit over 60...).

Cycle wheels would be better than bicycle wheels for sure (some had them) but the combination of cornering forces and bumps can generate a fair amount of side-load. Just sayin'.




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Old 08-12-2015, 02:38 PM   #8 (permalink)
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For engine building see the Ruckus project scooter at MotoIQ.com.
Wheels come in spokes and disc types. Please make sure the spoke type has each spoke crossing two others and are properly tensioned.
If available try to find tubeless radial tires with a linear tread.
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Old 08-12-2015, 11:24 PM   #9 (permalink)
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3 wheels are allowed for prototype category while im joining urban concept Only 4 wheels are allowed as it mimic real cars.

Just read motoiq. Really indepth view of building gy6 but im x sure WPC treatment is available here.

Is cvt a good choice for good mpg? As cvt have unlimited ratio so i can get the speed At lower rpm.
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Old 08-13-2015, 12:11 AM   #10 (permalink)
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Perhaps you can research what past winners/top finishers used.

Failing that, I'd look for the tire with the slickest tread design and the lowest load rating, as that one will likely be thinner.

In any case, if you can do it, converting to tubeless would likely lower r.r.

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