]Full Credit to JohnnyR24 for giving me the idea,(running low on money, as soon as i get it i will buy) but i'm using 2 4x9x4 mm bearings per wheel, it's working very well, completely reversable.
The bearings sell for around £5 for 20 and you need 12 per car, including the zero car, Full tutorial below. please note these are the prices and listings for amazon.co.uk prices may vary, so may listings.
1 car=24 bearings= £10
2 cars=36 bearings=£10
3 cars=48 bearings=£15
4 cars=60 bearings=£15
5 cars=72 bearings=£20
formulae= Nx12+12 N=The amount of cars
Edited by CrayCray for coasters, 12 April 2020 - 05:00 AM.