Under the company's own brand "GALE SPEED" developed by Active, the aluminum forged wheel TYPE-GP1S for ZX-25R is available in three sizes.
As a comprehensive motorcycle parts manufacturer, we have verified the best suspension settings for each wheel size on the street and on the circuit.
* Implemented by installing "BRIDGESTONE S22" tires on all wheels to verify the same conditions.
We hope that by publishing the results on this page and in the instruction manuals for wheels, it will be helpful for customers to enjoy motorcycles more comfortably. |
The genuine wheel size of ZX-25R is "F 350-17, R 450-17".
At GALE SPEED, "F 300-17, R 400-17" and "F 300-17, R 425-17", which are lighter and have better turning performance with a narrow rim width, and "F 350-" as a unique custom proposal. 17, R 550-17 "set lineup.
Initially, the rear 550-17 was worried about the spoil of vehicle performance due to its unique size, but it proved that there are sufficient advantages in terms of weight and maneuverability, and the lineup has been realized as a new custom style option. bottom.
Click here for details ⇒ <Past article ZX-25R 550 Wheel development secret story> |
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| Emulsion type (with HPA) |
Tank type with hose (with HPA) |
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| Setting according to the wheel |
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| R 550-17 wheel and suspension settings |
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| The characteristic of the rear 550 size wheel is the impact that is comparable to that of a big bike. If you think about it normally, the bigger the wheel, the heavier it will be, and with the weight and torque of 250cc, it will be difficult to handle and line trace. |
However, as you can see in the comparison table below, the GALE SPEED wheel (R550-17 set) is 0.1kg lighter even if the front and rear tire weights are included. In addition, the design that centers the center of gravity reduces the gyro effect, further reducing the weight experienced.
The HYPER PRO Japan Spec rear suspension adjusts to the optimum ride quality with a wide adjustment range in response to changes in vehicle body posture that change significantly from the genuine one.
The recommended setting for this wheel size is to increase the rear shock preload by +3 revs. Considering that the contact area of the tires will increase and the grip force will increase, the rear vehicle height is raised by preload adjustment instead of vehicle height adjustment. As a result, the caster angle is reduced, so even voluminous tires can be handled quickly and lightly. |
Right: Suspension development manager Uda |
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| ◆ Weight comparison table |
NOMAL |
GALE SPEED |
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front
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rear
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front
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rear
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tire size
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110/70R17
SPORTMAX GPR-300
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150/60R17
SPORTMAX GPR-300
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120/70ZR17
BRIDGESTONE S22 |
180/55ZR17
BRIDGESTONE S22 |
Wheel size
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350-17
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450-17
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350-17
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550-17
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Wheel weight
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5.0kg
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6.8kg
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3.7kg
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5.5kg
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Tire weight
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3.8kg
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5.5kg
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3.9kg
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6.7kg
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| Tire + wheel weight |
8.8kg |
12.3kg |
7.6kg |
12.2kg |
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| ◆ Front: 350-17 / Rear: 550-17 |
Preload recommended settings
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Genuine suspension
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HYPERPRO
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+1 step
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+3 rotations |
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| * For the front suspension, refer to the instruction manual attached to the rear shock. |
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| <Notes> |
| The size of the rear "550-17" wheel changes significantly from the normal wheel / tire. Please be careful when you start driving, as the riding feeling will change significantly. In addition, the intervention of traction control installed in the vehicle may be accelerated when driving on a circuit or under heavy load. There is no danger in driving due to this, but if you have any problems in this case, please drive with traction control turned off. |
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| R400-17, 425-17 Wheel and suspension settings |
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| In addition to the significant weight reduction of the wheels, the contact area of the tires is smaller, so it is a size that allows you to maximize the lightness of vehicle control in situations where there are many turns such as circuit driving. |
Furthermore, by changing to the HYPERPRO suspension, the road surface followability is improved and the original performance of the wheel can be brought out.
We recommend R400-17 for quick handling such as racing and circuit use, and R425-17 for settings to add a little sense of stability. The recommended suspension settings for each are as shown in the table below. However, strictly speaking, the genuine suspension cannot be finely adjusted, so "standard" is recommended. |
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Right: Suspension development manager Uda |
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| ◆ Front: 300-17 / Rear: 400-17 |
Preload recommended settings
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Genuine suspension
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HYPERPRO
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Standard
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Standard |
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| * For the front suspension, refer to the instruction manual attached to the rear shock. |
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| ◆ Front: 300-17 / Rear: 425-17 |
Preload recommended settings
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Genuine suspension
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HYPERPRO
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Standard
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+0.5 rotation |
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| * For the front suspension, refer to the instruction manual attached to the rear shock. |
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| What is the point of wheel size selection? |
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| Three size lineups that can be selected according to the situation |
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・ Those who want to maximize the advantages of lightweight wheels.
・ Those who want to enjoy mainly racing and circuit driving. |
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Circuit driving impression by the rider (GALE SPEED wheel + HYPERPRO suspension)
You
can run lightly and lightly even when you push it inward. I think it's the best size on the circuit. Since there is a lot of tilting, the degree of freedom of the line is high, and you can make a fluttering turn and run very happily. |
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・ Those who want to experience the characteristics of purely lightweight wheels.
・ Those who do not want to change the silhouette from genuine.
・ Those who want to enjoy both street driving and circuit driving. |
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Circuit driving impression by the rider (GALE SPEED wheel + HYPERPRO suspension)
Compared to the rear "400-17", the tires are flatter and the tracking timing due to weight shift is different. It can be considered as one of the car body settings by selecting a course in a full-scale race. |
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・ Those who are attracted to customs that are different from people.
・ Those who want to change the silhouette from genuine.
・ Those who mainly drive on the street. |
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Circuit driving impression by the rider (GALE SPEED wheel + HYPERPRO suspension)
I thought it would be heavy, but it's not so bad. There is no feeling of bouncing, it is moist and stable.
I think the race size (F: 300-17 / R: 400-17) is the best if you are trying to set the time or compete. |
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| Impressions about the suspension of HYPER PRO |
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Circuit driving impression by the rider (with hose type HPA with tank)
The shock setting when changing to thin tires is also good. The thinner the tires, the stronger the disturbance, but it absorbs it well. The vehicle is calm and organized as a whole, and it is stable, so the accelerator can be opened quickly. Suspensions that allow you to feel the effect of changing the number of clicks on compression are rare. |
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