Originally Posted by 94eg!

If you switch to the new short arms, you can start with the blocks that come with the TRF416-Worlds Edition (1C/1C & 1XA/1F). It has no front arm sweep and 3.5* rear toe. You need to buy the TB03/416 version of the 1C block for the rearward front mount cause it must be flipped upside down and mounted atop 3mm spacers to clear the belt (416 style). This is because there is no "bridge" version of the 1C, and there older 415 1C block cannot be flipped upside down. For other short arm setups, check the Jilles Groskamp thread...

With the standard arms, go for the blocks used on the MSXX. They have a little front arm sweep and 3* toe in the back. Runs quite nice at my local hobbytown parking lot track.

MSX tip: Get the new TRF Fluorine sealed 950 bearings for the wheels. These will keep the dirt out and make the bearings last a million times longer than the standard sheilded ones. I've got half a season so far with zero maintenece, where the metal bearings need to be cleaned & oiled after two race days (and still get ruined). You will need 4 pairs of the 950 size. RDVTG Hobbies on eBay sells them for $5.30 a pair and cost only $2+1 each item to ship. Plus they get here in only 5 days (from Japan).

You can also switch to the newer style hubs from the 416 & TB03, but they require many other parts to make them work (uprights, C hubs, wider axles, 1050 bearings, 2mm shorter driveshafts & new king-pins). For 17.5, the 950 bearing suspension should be fine...