Inner tube 70/100-19 straight valve

Size

70/100-19 inner tube: 70 mm wide, 19 inch rim. This size fits light electric motorcycles, notably the Sur-Ron Light Bee and the Talaria Sting.

Beware of the digit order

Motorcycle notation puts the width first and the sidewall ratio second: 70/100 means 70 mm wide, with a sidewall equal to 100 % of that width. The 100/70-19 does not exist in this family — it is a common transposition.

The two standard fitments on these machines are 70/100-19 at the front and 80/100-19 at the rear.

Straight valve

The valve is perpendicular to the rim, with no bend. This is the standard fitment on this type of wheel, where access to the valve is unobstructed.

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. On a spoked wheel, also check the condition of the rim tape.