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Post by scooter on Nov 2, 2014 12:49:09 GMT -5
I am not sure but it looks like I need a new rear tire. It's not like a car tire. It's some fancy thing with strange nubbles on it. Is that word? If not, I call it! It loks kind of bald but it also looked that way when I got it. It stops the bike really well, even in rain and seems to work fine but it looks like maybe it's time to replace it. I don't know.
I will post a picture of the tire here in a bit.
The bike plate says I need a 4.00-12 (UPDATE THIS IS THE RIM SIZE MT2.75*J12) rear tire and I have a 120/70-12 tire now. Is that the right tire? Also, can I use a taller tire for higher gearing? If so, what sort of options do I have? My rim says it is tubeless, and I assume the tire is tubeless.
Also, what about mounting? Can any old tire dealer mount a scooter tire? Is it something I can do myself? Those aluminum rims look easy to damage.
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Post by ccr on Nov 2, 2014 13:24:28 GMT -5
I am not sure but it looks like I need a new rear tire. It's not like a car tire. It's some fancy thing with strange nubbles on it. Is that word? If not, I call it! It loks kind of bald but it also looked that way when I got it. It stops the bike really well, even in rain and seems to work fine but it looks like maybe it's time to replace it. I don't know. I will post a picture of the tire here in a bit. The bike plate says I need a 4.00-12 MT2.75*J12 rear tire and I have a 120/70-12 tire now. Is that the right tire? Also, can I use a taller tire for higher gearing? If so, what sort of options do I have? My rim says it is tubeless, and I assume the tire is tubeless. Also, what about mounting? Can any old tire dealer mount a scooter tire? Is it something I can do myself? Those aluminum rims look easy to damage. ok here you go,  |
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Post by ccr on Nov 2, 2014 13:36:05 GMT -5
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Post by surfpick on Nov 2, 2014 18:15:19 GMT -5
Wheels that are balanced using weights go out of balance as the tire wears down. This doesn't happen with DynaBeads or RideOn . Has anyone tried either product? |
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Post by scooter on Nov 2, 2014 19:17:33 GMT -5
Thank you. Does increasing the height of the sidewall have any ill effects on tire performance or stability? Will a taller tire be more likely to wrinkle or fold or do any other weird stuff while I'm driving on it? |
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Post by scooter on Nov 2, 2014 19:24:12 GMT -5
I need to figure out some math. I know even a mm on the variator can seriously affect acceleration and top end, and the clutch bell turns about 8.75 turns for every turn of the wheel.  I am just not sure yet what that means. I will edit this when I figure it out but you guys feel free to interpret it for me if you can. |
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Post by ccr on Nov 2, 2014 19:44:16 GMT -5
Thank you. Does increasing the height of the sidewall have any ill effects on tire performance or stability? Will a taller tire be more likely to wrinkle or fold or do any other weird stuff while I'm driving on it? a wider tire gives more stability and grip when cornering, that's why racing bikes have fatter rear tires. but with it being wider, 2 things occur. 1- more rotating mass, meaning the wheel needs more turning power to go and more stopping power to stop. 2- bigger tire profile, increases drag when the wind hit's it. taller tires can also have more rotating mass and the benefit of them comes from more distance traveled to wheel rpm. they also make the ride height slightly higher. and they create a stronger gyro effect making bumps less of an issue another thing i forgot to mention was that you need to check the suspension clearance if you install a bigger tire. the last thing you wand is for your wheel to scrape the bottom of your seat whenever you go over a bump |
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Post by scooter on Nov 2, 2014 20:09:13 GMT -5
Thank you. Does increasing the height of the sidewall have any ill effects on tire performance or stability? Will a taller tire be more likely to wrinkle or fold or do any other weird stuff while I'm driving on it? a wider tire gives more stability and grip when cornering, that's why racing bikes have fatter rear tires. but with it being wider, 2 things occur. 1- more rotating mass, meaning the wheel needs more turning power to go and more stopping power to stop. 2- bigger tire profile, increases drag when the wind hit's it. taller tires can also have more rotating mass and the benefit of them comes from more distance traveled to wheel rpm. they also make the ride height slightly higher. and they create a stronger gyro effect making bumps less of an issue another thing i forgot to mention was that you need to check the suspension clearance if you install a bigger tire. the last thing you wand is for your wheel to scrape the bottom of your seat whenever you go over a bump Sounds good. It looks like I have at least 5 cm of clearance around the tire and plenty of room between the tire and the mud guard, so one cm larger should fit fine. Now I just have to figure out how that will affect acceleration and whether I can pull the extra diameter on the top end. |
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Post by ccr on Nov 2, 2014 20:13:30 GMT -5
I need to figure out some math. I know even a mm on the variator can seriously affect acceleration and top end, and the clutch turns about 8.75 turns for every turn of the wheel. I am just not sure yet what that means. I will edit this when I figure it out but you guys feel free to interpret it for me if you can. one thing about CVT transmissions is that they don't take number A and convert it into number B they rely on torque (A)and rpm (B) input multiplied and converted into gearbox rpm(C) divided by the mass and resistance of the rear wheel(D) it's not a simple equation and the only way to do a scientific test is to test both tires at a certain rpm with the exact same road conditions and the exact same temperatures and see which one is faster, and then change the variator weight and clutch spring and final drive gears until you find the best performance. if i were you, i would just slap it on and see what top speed you get from it and compare with the original also the time it takes to get to that top speed. to be honest, i'm only 24 years old and i'm a bit of a psycho when it comes to speed. anything that i can possibly do to increase the top speed and the time it takes to get to it i had already done to my previous scooter. i would say if your more inclined to do long straight rides or you don't mind hanging off the side of the scooter a little bit more on corners you should get the taller tires. whereas if you are doing more busy city snaking through traffic riding then the wider tires will offer you more stability when turning i used maxis race tires 100/100-10 on the rear wheel with 100/  -10 on the front. top speed 130km/h and could weave through any traffic jam. i had a stock gear setup on mine though and a really high rpm 2V engine. it would always overheat and needed a tonne of rpms to get moving. this time i want to go for a well ported high compression 4 valve with less rpm's (i'm really worried about valve float and valve bounce because i always drove WOT and could sometimes hear the valve bouncing when pushing it hard) so i will be gearing the final drive up to reduce the required rpms to reach the same speed but keep the rpm lower. |
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Post by scooter on Nov 2, 2014 20:54:02 GMT -5
Wheels that are balanced using weights go out of balance as the tire wears down. This doesn't happen with DynaBeads or RideOn . Has anyone tried either product? I have two small bottles of it but have not put it in yet. |
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Post by shalomdawg on Nov 2, 2014 21:01:14 GMT -5
howdy, i'm as ignorant as the next guy but it is my understanding just from experience that the 4.00-12 would be a tube type tire. if your wheel needs a tube because it is not a tubeless rim, even the tubeless tire will have a tube in it. just saying---
lotsa miles and smiles to ya
ken
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Post by scooter on Nov 2, 2014 22:36:10 GMT -5
howdy, i'm as ignorant as the next guy but it is my understanding just from experience that the 4.00-12 would be a tube type tire. if your wheel needs a tube because it is not a tubeless rim, even the tubeless tire will have a tube in it. just saying--- lotsa miles and smiles to ya ken The tire is a kenda k761-013. I don't know how to tell if it's a tubeless tire or not. It is frustrating. Even Kendatire.com doesn't say on the listing whether or not it uses a tube. Looking at the original tire online, it is clear that the person who sold the scooter to me lied about it being a newer tire. It needs to be replaced pronto. I am looking at one with a taller sidewall, same tire, taller sides, for about $25 more than the original. It has a higher weight rating than the original which is nice, and it will gear me up a little, which I'm not sure is good yet. |
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Post by scooter on Nov 2, 2014 23:12:00 GMT -5
howdy, i'm as ignorant as the next guy but it is my understanding just from experience that the 4.00-12 would be a tube type tire. if your wheel needs a tube because it is not a tubeless rim, even the tubeless tire will have a tube in it. just saying--- lotsa miles and smiles to ya ken Okay I looked at the tire again and it says "load range B tubeless" so I guess it's tubeless. |
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Post by surfpick on Nov 3, 2014 8:08:29 GMT -5
Wheels that are balanced using weights go out of balance as the tire wears down. This doesn't happen with DynaBeads or RideOn . Has anyone tried either product? I have two small bottles of it but have not put it in yet. That's the tricky part. Some people have gone cuckoo trying to get them down the valve stem & ended up spraying them all over their garage. I've seen people in videos using an air hose (very carefully) or a straw to blow them in. Others hold an engraving tool against the valve stem to vibrate them in. The reviews I've seen of their performance in reducing existing vibrations & wobble have been almost universally enthusiastic. I'm planning on using Dynabeads when I mount new tires. |
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Post by scooter on Nov 3, 2014 16:31:21 GMT -5
I have two small bottles of it but have not put it in yet. That's the tricky part. Some people have gone cuckoo trying to get them down the valve stem & ended up spraying them all over their garage. I've seen people in videos using an air hose (very carefully) or a straw to blow them in. Others hold an engraving tool against the valve stem to vibrate them in. The reviews I've seen of their performance in reducing existing vibrations & wobble have been almost universally enthusiastic. I'm planning on using Dynabeads when I mount new tires. Good deal. My local Harley shop says the DynaBeads are good. |
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-10 on the front. top speed 130km/h and could weave through any traffic jam. i had a stock gear setup on mine though and a really high rpm 2V engine. it would always overheat and needed a tonne of rpms to get moving.
