LAMBRETTA Riders

No, the modern Scooter way of doing it is to use a larger diameter and wider tyre on the rear. But it is not uncommon to see a larger diameter tyre on the front, but try to use a narrower tyre if possible.

Originally Lambrettas used 3.50:10 tyres front and back which for a long time limited what could be fitted. (Aftermarket 4.00:10 tyres used to be available but are now out of favour with the manufacturers, Schwalbe do not do an equivalent metric version)

With the introduction of metric tyre sizes a number of tyres can now be used.

These can be 3.50:10, 100/90:10 and 100:80:10. (A tyre size can change from manufacturer to manufacturer. It's worth measuring your existing rolling circumference to compare to Schwalbe tyre circumferences)

You can use 3.50:10 front and rear, 100/90:10 front and rear or 100/80:10 front and rear.

There are three ways to choose tyre sizes:

1. Fit the same tyre front and back
2. Fit a wider tyre on the rear
3. You can use the same type of tyre front and back or mismatch tyre types to suit your riding.

There are two types of tyre sizes.

1. Imperial
2. Metric

For example:

1. Imperial. 3.50:10, means the tyre width is 3 ½ inch wide (88.9mm) the tyre profile on an imperial tyre is 100% of the width, which in this case is 3 ½ inch tall (88.9mm) And the ten is a 10 inch wheel rim.
2. Metric. 100/90:10, means the tyre width is 100mm, and has a tyre profile of 90% of the tyres width, in this case it would be 90mm tall and has a 10 inch wheel rim.

A good question, answer is that we do not know, but

10 inches = 254mm
11 inches = 279.4mm
12 inches = 304.8mm
13 inches = 330.2mm
14 inches = 355.6mm