Four wheel drive question

[haverfordfords]

I saw this FAQ on the IFIrobotics.com Site...

So, we also need the sold out hubs? Does this mean we also need an additional chain OTHER than the one included. Also, the sprockets listed below - those are IN ADDITION to the ones already in the kit (all four of them?), correct?

Sorry if this is a stupid question...

Thanks,
Jason

"What do we need and how do we make a four wheel drive system out of what we have in the kit?

Please check section 3 in the "2005 FIRST Robotics Competition Kit Transmission Manual -RevA" document located at http://www.ifirobotics.com/kitbot.shtml.

You do not need the custom PVC spacer used in the 2 wheel drive configuration and you need to use the 40mm key provided in the kit instead of the 20mm key. You also need additional parts to make the 4 wheel drive configuration. The additional parts you need are:

1. 21 tooth sprocket - Quantity 2. Available from ifirobotics.com
2. 28 tooth sprocket - Quantity 2. Available from ifirobotics.com
3. Skyway wheel hubs - Quantity 2 sets.
4. 10' of chain. Available from ifirobotics.com"