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When I bought it this time, I looked at various sites and bought XAMBrand because it was said to be very good.
After driving a few miles with it, I can say that it feels much smoother.

I used a 13T.

The product image shows a flesh-cutting process, but in reality it is not.
In the case of the VTR, it is more troublesome to remove the Sprocket cover.

I have purchased a number of FrontSprockets made by XAM and they have all been very accurate and durable.
It is more expensive than OEM Product.
The machining accuracy of the Spline is satisfactory and it is easy to remove and install.
If the accuracy of the spline is not good, it will be worn out gradually by the wobble etc., and the sprocket will start to get out of control, oil will leak from the seal, and in the worst case, the shaft spline will be damaged, and you will have to break the lower back of the engine to replace it. I think.

The image shows the Seal chain with about 1500km on it, but with this level of use, it is still as durable as new.
At 13T, the chain is bent tighter than OEM, and the strain on the Sprocket must be higher, but the gears still look Large and strong.

I'm not going to go into the Final changes here as I'm sure many people have already mentioned them, but the acceleration is better and the engine roars when cruising.

We continued to exchange Front as well as Rear, Chain,
It is OEM 14T but it is changed to 15T of 1 doubt.
, But Manufacturer stock was delivered in one and a half months after placing an order.

After exchanging, you can see that Rear tire rotates smoothly.

I got a Front 1, but since Rear gave 6 dives

OEM

F : 14 R : 45 (Final3. 214)

Change

F : 15 R : 51 (Final3. 400)
It became a feeling.

Acceleration has improved dramatically because of ShortSetting. Although Shift is busy, I feel quite like it because I feel calmer than 14-51 waiting for Front.

In the case of HORNET 16T seemed to interfere.
I think it is up to 15T. For your reference.

VTR 250 Gymkhana is a combination of F13T and R44T for vehicles.

For reference, Limit is sufficient for Number of links on the OEM 104.

Manufacturer which can choose from 13T to 15T can select SUNSTAR and XAM, but this time SUNSTAR selects this as being a missing item this time.

In the last SUNSTAR, the Sprocket's teeth ended at 15000 km, but I would like to report someday how much the XAM durability performance is.

Thanks to Hole processing, it is made quite lightweight.

Parts of invisible part, but the goodness of making is shining.

I run the Circuit with VTR 250, but it was hard to run if I stayed at OEMSprocket so I tried 13 Front.

Although Sprocket originally used XAM, it can not compare very much with other Brands, but it is unchanged reliability and can be used without any problem after exchange.

As an impression that changed to 13, as Circuit often goes to ShortCourse, taking into consideration that Mission is 5th speed, it got easier to ride than OEM.
However, since it seems that the deceleration by the emblem is larger than the OEM, it seems that Large became bigger, so I think whether the rotation speed has become Large thing.