8.5x2-6.1 reinforced inner tube straight valve

Size

8.5x2 inner tube. This size fits the Xiaomi M365, M365 Pro, 1S and machines built on the same base. The rubber adapts to a range of widths around 2 inches.

Reinforced wall

The rubber is thicker than on a standard tube. It resists pinching during fitting, light punctures and kerb impacts better. In return, it is heavier and slightly stiffer to fit.

This is the version to offer for intensive use, heavy loads, or a customer who keeps coming back with punctures.

Straight valve

The valve is perpendicular to the rim, with no bend. This is the simplest and most common fitment: it works whenever nothing obstructs access to the valve — no brake disc or motor facing it, and enough clearance under the mudguard.

On rims where access is restricted, an angled valve is required. Check the angle of the original tube before ordering: this is the leading cause of error on this product family.

Fitting

Sold individually. Inflate the tube slightly before inserting it into the tyre to avoid folds, and make sure it is not pinched between the bead and the rim before bringing it up to pressure.