We need another Tire thread

[Wahrsuul]

I thought the red dot went opposite of the valve stem?

 

[SPECTACUALR SPIDERMAN]

Car tires have a stiffer sidewall then bike tires

 

[SCWSpyder]

Thanks all for input!

 

[Gwolf]

I thought the red dot went opposite of the valve stem?

The red dot is to mark the highest point of radial runout. If your wheel is marked for radial runout, you could use that to mount the tire. Most of the tires are mounted using the yellow dot, which is the lightest point, by weight on the tire. The yellow dot goes at the valve stem hole.

 

[Gwolf]

Hi All! New spyder owner-to-be. Comment/Question: first dealer visited told me car tires have softer sidewalls which have a greater “roll under” than the stock tire which thereby makes the “electronic nannies” come on sooner (computer senses change in tire dimension thereby applying brakes) especially on a curvy road. So his opinion is they fit but are not functionally as good. I’d like an opinion as all local dealers are affiliates of the same org. Thanx!

I could be wrong, but I was under the impression the nanny used G forces to sense when the cornering speed was too high. In the case of G-forces, the sensor would not be affected by the tires at all........ only G-force of the turn.

 

[IdahoMtnSpyder]

I could be wrong, but I was under the impression the nanny used G forces to sense when the cornering speed was too high. In the case of G-forces, the sensor would not be affected by the tires at all........ only G-force of the turn.

Correct! 2nd image is enlarged portion of first image.

 

[Gwolf]

Yeah, I just dug into the tech stuff. The yaw rate sensor is located up on the front end under the instrument panel. It could not possibly know what the tires were doing. It is only concerned with the G-forces being applied by the turns. It measures and compensates by G-forces.

 

[h0gr1der]

I could be wrong, but I was under the impression the nanny used G forces to sense when the cornering speed was too high. In the case of G-forces, the sensor would not be affected by the tires at all........ only G-force of the turn.

I found out that regardless of G forces, if you lift a wheel the Nanny takes action! In my case on the 2018 RTL it just chopped the throttle for a brief second, then went right back to WOT when the wheel started spinning again. Wheel speed sensors play into the equation.

 

[Gwolf]

I found out that regardless of G forces, if you lift a wheel the Nanny takes action! In my case on the 2018 RTL it just chopped the throttle for a brief second, then went right back to WOT when the wheel started spinning again. Wheel speed sensors play into the equation.

Yeah, it is all tied together. The yaw sensor, front and rear wheel speed sensors, steering angle sensor, pillion rider switch, brake fluid level sensors, it all works together to determine when the nanny takes some action and what action it takes.

Even if the nanny is being activated by the tire lifting, there is also lateral G-forces working to lift the tire. Tires don't normally lift going in a straight line. The steering angle sensor is feeding the handlebar position into the computer also, which would be telling the computer if the wheel lifted due to a straight line jump or due to lateral forces in the turn.

 

[Fat Baxter]

Yeah, it is all tied together. The yaw sensor, front and rear wheel speed sensors, steering angle sensor, pillion rider switch, brake fluid level sensors, it all works together to determine when the nanny takes some action and what action it takes.

Even if the nanny is being activated by the tire lifting, there is also lateral G-forces working to lift the tire. Tires don't normally lift going in a straight line. The steering angle sensor is feeding the handlebar position into the computer also, which would be telling the computer if the wheel lifted due to a straight line jump or due to lateral forces in the turn.

This is a good time to ask something I've wondered about: has anyone ever flipped a Spyder in a hard turn? I know you can take a turn too wide, and wind up going into the weeds. But if you've got your steering dialed in correctly, and you hold it while at speed, can you flip a Spyder? Or will the nanny save you very time?

 

[IdahoMtnSpyder]

This is a good time to ask something I've wondered about: has anyone ever flipped a Spyder in a hard turn? I know you can take a turn too wide, and wind up going into the weeds. But if you've got your steering dialed in correctly, and you hold it while at speed, can you flip a Spyder? Or will the nanny save you very time?

AFAIR, there has been no mention of anyone flipping a Spyder by turning too sharp, other than one guy who flipped his boss's Spyder by turning too sharp while going too fast in reverse! One guy flipped his when a car forced him into the median divider. And there a few that turned over in accidents. We should never say never, but it's pretty nigh impossible to flip a Spyder by turning too sharp. One thing Nanny is good at is being quick and decisive. She'll throttle back and hit the brakes as soon as she senses the forces necessary to flip over. That is, on a flat road. If you're going on a sidehill then it's a different game. A quick turn toward uphill just may cause one to flip since the force it takes to turn over will be less than on the flat.