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Post by scootnewb on Apr 27, 2018 0:30:51 GMT -5
I saw some cool fat wheels but they were for the Ruckus and required an extension kit. What is the fatest rim tire combo I can fit without an extension? and --- Would 12 inch rims and tires work?
Thanks
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Post by 90GTVert on May 1, 2018 18:45:16 GMT -5
I just barely squeezed a 120/90-10 onto a short case with a little work. There would be 12" wheel/tire combos that are that size or smaller. If you want a wide/fat tire, then usually people get a hub and use ATV style wheels or custom made wheels. A hub could be made from an old wheel. Cut the center section out, where the drum is and drill it for wheel studs in the appropriate patter for a wheel that you find. Hub bolts on just like it did when it was a wheel and lets the drum brake work. New wheel bolts to it. Gotta have a wheel of the proper offset or backspacing to work, and then the wheel won't be centered in the frame. I'd guess you'd want to modify the engine mount's lateral positioning to compensate. Big fat tires on scoots aren't really my thing so I haven't looked into it much. 49ccscoot.proboards.com/thread/827/rear-tire-short-case-139qmb |
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Post by scootnewb on May 1, 2018 20:33:30 GMT -5
I just barely squeezed a 120/90-10 onto a short case with a little work. There would be 12" wheel/tire combos that are that size or smaller. If you want a wide/fat tire, then usually people get a hub and use ATV style wheels or custom made wheels. A hub could be made from an old wheel. Cut the center section out, where the drum is and drill it for wheel studs in the appropriate patter for a wheel that you find. Hub bolts on just like it did when it was a wheel and lets the drum brake work. New wheel bolts to it. Gotta have a wheel of the proper offset or backspacing to work, and then the wheel won't be centered in the frame. I'd guess you'd want to modify the engine mount's lateral positioning to compensate. Big fat tires on scoots aren't really my thing so I haven't looked into it much. 49ccscoot.proboards.com/thread/827/rear-tire-short-case-139qmbWoah! You can put 12 inch rims/tires on this? That would be great! I don't feel safe riding this above 35 the way it is now. It seems to be a brick on wheels. Dies putting taller rims/tires require cutting the center section out. That is a little advanced for me. |
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Post by 90GTVert on May 1, 2018 22:27:49 GMT -5
Sorta... You can't just put any 12" wheel and tire on. It would have to be stuff comparable to stock width and overall outside diameter. A 12" wheel off of a long case could be too wide. I'm not real sure if there are any 12" wheeled short case 139QMBs around to source wheels from.
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Post by ThaiGyro on May 4, 2018 6:26:00 GMT -5
In case it helps...here is some relatively simple math to consider when researching new rubber:
I will use 90GTvert tire size: 120/90-10
For those not tire/tyre saavy, look at the numbers, which are always given ass backward to a somewhat normal brain wave.
120 is the rough tire width
90 is the "aspect ratio", meaning the percent of width to height from the rim.
10 is the wheel diameter
The reason I say backward? I think of tires like you stated. WTF size will fit? WTF size are my OEM wheels?
In this case they are "10 inch". The last number.
Any tire is listed as 90gtvert stated, "120/90- 10".
For measuring in any country, that looks like this:
120mm width/90 percent aspect - on a 10 inch wheel.
Or, in USA:
120, divided by 25.4mm per inch = 4.7244 inches (millimeters to inches)
90% aspect ratio = 4.7244 x .90 = 4.2519 (height from rim to outer radius)
10 inch wheel...
Therefore, to figure a close approximation of tire fitment, you need to know the overall radius or diameter.
Again, vert size: 120/90/10
From above- 4.7244 inches, times 90 percent, equals 4.2519 inches, so you first use the proportional wheel diameter, which is 10 inches. Then add the aspect ratio (tire rim to outer circumference), then add it again, because the tire/wheel is round, so you see that tire above and below the rim...with me?
Like this: 120/25.4*.90=4.2519 inches, times two = 8.5039, plus 10 inch wheels, = 18.50+/- wheel/tire diameter.
That is the close math and not hard to follow. What you need to understand, beyond that calc is that the tire dimensions are not true and are affected during operation by heat, humidity, air pressure and speed! Your tires grow taller as your brain gets smaller. Too much detail to be concerned with there.
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Post by golfmech on Jul 25, 2018 21:04:35 GMT -5
my roketa is a short case 139qmb that came stock with 100/60-12 wheels and tires I'm waiting for a new 110/70-12 to show up from what I have found online 110/70-12 should be the largest 12 a short case can fit
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Post by muskin on Aug 1, 2018 3:53:46 GMT -5
where would you find the 100/60-12 wheels.
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