Slot.it GM25i - Modular Inline crown - 25 teeth

2 part gear Inline crown gear
1 x 25 tooth gear (orange) -
3 x 0.1mm thickness washer -
FOR: 3:32" - 2.38 Axles

Use with GMF55 or GMF60 (not included)

About the M racing crowns (M is for Modular)
Consider a traditional Slot.it crown: you know that the motor shaft is rotating inside a groove, the groove keeps the shaft in the right place, and this precise alignment keeps the pinion's teeth happily meshed to the crown's.
Poor maintenance, or excessive loads, may wear the outside wall of the groove out, leading eventually to the destruction of the crown itself. Why? Mostly because the shaft and the gear, on the opposite side to the gears, rotate one against the other in two opposite directions : if the pressure between the two parts breaks the oil film, the crown starts to wear out, despite us using the hardest bronze, and chemically hardened aluminium with teflon coating.

So now we have the M crowns which are composed by three basic pieces:
1. the gear side: the gears are exactly the same as the usual Slot.it crowns with a new insert. The insert has a non threaded hole.
2. the lock ring: this is the part that keeps the shaft in place. There are two types: one is for the 5.5 mm pinion, one for the 6mm pinion.
3. the steel washers: they works as a bearing, free to rotate independently from each other and from the mutual movement of the crown and the shaft, nicely floating on a layer of oil.

Less friction, less wear, more performance, and more gear ratios from the same crown!

Using them is easy, but they require proper assembly whereas the original Slot.it crowns are literally plug and play. The new M crowns require some attention and some basic skills.
Make sure of the following:
1. there must be TWO washers between the shaft and the lock ring.
2. the grub screw MUST go all the way through to the shaft. In other words, make sure that the grub screw is inserted through the hole on the sleeve on the crown side.
3. the washer on the gear side is optional.
4. put a drop of oil on the two washers.