Tire pressure in spring
Wed, 13 Mar 2019

Knowing Spring by Road Surface Temperature

The maximum temperature has risen to near 20 degrees Celsius for the past few days. The parking lot of my house is also covered with petals from cherry blossoms that bloomed nearby... It's spring!
I've been refraining from riding my bike to work in Tokyo for a while because I didn't want to get hurt by mistake.
The tire pressure was a little lower than I had set during the winter, but I set it a little higher than the default pressure I like. In the winter, the wind can chill the bike, and when I touch it after stopping, the rear wheel is a little warm but the front wheel is cold, so I set the air pressure a little lower just in case (2.0kpa, 10% less than the Ninja 650 default)....
It's been a while since I've set my preferred air pressure (2.3kpa on the front wheel, 2.7kpa on the rear wheel, a little higher than the default), and I'm enjoying riding my bike even more because it's light and easy to corner.
The route from my house to the Tsuzuki Interchange on the Daisan Keihin Expressway, which I used to take back and forth a lot when I was nursing my cat, has a winding descent through a hilly residential area, and every time I drive there lately, I feel"Unreliability of the front desk"It also eliminates things like.
Now that the odometer has reached 25.000km, I thought it was time for an overhaul of the front forks and suspension, but it seems that the air pressure that I had dropped during the winter had a big impact.

Front wheel:2.5kpa/rear wheel:2.9kpa

Ever since my Ninja 400 days, I've always preferred higher air pressure. When I switched to PIRELLI Angel ST tires on my Ninja 400, I read somewhere that the manufacturer's recommended air pressure was 2.5 for the front wheel and 2.9 for the rear wheel, and after consciously checking the ride quality at slightly higher pressures, I found that I clearly preferred slightly higher pressures than the default.
The tire I'm wearing now is BRIDGESTONE's BATTLAX T31, which like the Angel ST is a touring tire with a bit of a sporting flavor.
The truth is.I wanted to wear METZLER's ROADTEC 01 or PIRELLI Angel GT, but they were not in stock at the store, so I chose them by elimination.Tires.
After I got my license, most of the bikes I rented were equipped with BRIDGESTONE S20 or DUNLOP D214, and I felt that they turned better and had a better feel on the ground compared to T31. I felt like I was going to regret my choice of T31s....
I thought to myself, "If I raise the air pressure a little higher, I'll like this better. I feel. If you Google it, you can find opinions like this....

As I have written many times, today's tires for large vehicles are designed to keep their shape by softening the structure and increasing the internal pressure (air pressure). And the standard for this is F : 2.5 R : 2.9 (Hayabusa and ZX-14R are 2.9 front and rear). So for vehicles with lower specified air pressure than this, 2.5 and 2.9 are worth a try.

— Bikers Station (@BikersStation) June 2, 2012.

Continued from yesterday. The reason why increasing the air pressure increases the secondary turning in particular is because the amount of deformation (crushing) of the rear tire becomes appropriate, and the rear ride height becomes normal (in this case, higher). (In this case, it is because the rear tires are deformed (crushed) properly and the rear ride height becomes normal (higher).

— Bikers Station (@BikersStation) June 3, 2012.

＞＞＞It's been a while since I started experimenting with increasing the F : 2.5 R : 2.9 for the > > models, and so far, the driving has been 100% better. I'm so confident about this that I've decided to write a more detailed article about it in the near future. I would like to add that the best time to do this experiment is when the tires are new. Please keep this in mind.

— Bikers Station (@BikersStation) June 3, 2012.

I also found this tweet from a guy who rides an ER-6n (naked version of the Ninja 650).

I was enlightened. I've been enlightened. For the Piloto Road 2, the correct air pressure is F2.5/R2.9. The specified air pressure for the ER-6n is F2.25/R2.5, and on the Diablo, which is on the edge of sport tires, it was bouncing around and scaring me on the rough curves. Maybe it could have been a little lower. To be continued

— Ducky G. Duck (@duckygduck) October 3, 2012.

With the PR2, cornering was stable like a magnet, and it handled rough surfaces with ease, so I thought the sluggish handling was just because it was a touring tire. To be continued

— Ducky G. Duck (@duckygduck) October 3, 2012.

When the PR2 was dying, I was concerned about instability at very low speeds, so I changed the air pressure to F2.5/R2.75. I changed the air pressure to F 2.5/R 2.75. The front end is set and runs straight. However, the braking power, which was originally quite inferior to that of the Diablo, seems to have been impaired a little again. To be continued

— Ducky G. Duck (@duckygduck) October 3, 2012.

I liked the front 2.5, but the rear still had a gnarly feeling. Even in the intense heat of this summer. So.@BikersStationI saw a tweet (later RT) from Mr. I raised it a little higher. My bike has been reborn! It's got some of the backwardness back that it's had since I got the PR2, and most importantly, it's easier to turn! To be continued

— Ducky G. Duck (@duckygduck) October 3, 2012.

Easy to turn around on winding roads. The rear tire responds linearly to the gas pedal! It felt like I could roll it over and up freely. It changed so much that I could probably run up the mountain at the fastest speed ever! I didn't think that tire pressure could make such a difference before the engine and suspension. To be continued

— Ducky G. Duck (@duckygduck) October 3, 2012.

Thanks to the low rear pressure, the behavior was quite gentle, but it was definitely too low. I'm pretty sure I was losing energy by deflecting the tires too much when accelerating and cornering!　So, the correct air pressure for the Pilot Road 2 is about F2.5/R2.9. To be continued

— Ducky G. Duck (@duckygduck) October 3, 2012.

Next time I go to GS, I'll try f2.6/r3.0. It's within the margin of error of the gauge. I had given up on the PR2, but now it feels like it's back. However, the PR2 doesn't have as much braking power as the Diablo, so I had to drive safely. I'm not athletic enough to blast down mountain roads, and I'm old.

— Ducky G. Duck (@duckygduck) October 3, 2012.

I've heard a lot of people say that "lower inflation pressures than the default are recommended when driving on the track," but at least when driving at a fun touring pace, I think it's best to use the inflation pressures that the latest touring tires were designed for. At the very least, it will give you the ride you personally prefer.
I've seen interviews with tire developers who say that they use higher air pressure to secure rigidity against softer materials and structures... This is a concept I've seen in interviews with tire developers.
Okay, this weekend is the first time in a long time that I'm going to go touring and try it out on the twisty roads.

Leave a comment

Post a comment

Reply to comment

Comment[You can use HTML tags for styling]

• Name
• E-Mail
• URL

Remember sign-in information

• Prev : Bonfire in the first day of spring
• Next : Save money on highways with Dora-wari in 2019