XRAY - Model racing cars

Gearing also depends on tire diameter. On a large 8th scale track I ran 2 teeth higher than the kit pinions. I also ran the tire diameter at 63 rear and 61 front, to start.

Hi Ron,

When your driving at the track in Heemstede you realy need to change the gearing. With the standaard pinions and spurs in won't work because its way to smal.
I drive a Mega MF engine and i use 18/59 and 23/54.
17/59 will also work at heemstede.
so you only need to change the pinions and you can use the standaard 59 and 54 spurs.

Greetz, Maarten

Hey Maarten

I found out today, i drive the same engine and it's way to low geared.
Hope to get other pinions this week..
Thanks for the reply man!

Greets, Ron

Is the choice of the pinions in the kit wrong chosen ?

I think a tracksize like Heemstede is common in most parts of the world.

Hi roelof,

I agree when your saying that heemstede is a common track size for tracks all over the world, but it depants on what engine you drive.
I thought that if you drive a CRf engine that you need a smaller gearing then the MF. and then the gearing in the kit is maybe alright.

Greetz,
Maarten

Yes, CRF needs a light gearing but is that the reason to choose the current pinions ?
I can not imagine that because the CRF is at this moment not a well used motor. Most 8th scale cars come with a gearing usefull for Novarossi (based), Picco (based) and Sirio (based) engines which take for 90% of the market of the racing scene.

Or is it better to include the 2 types of gearing ?