Injection-Molded Sprocket Set 8T GM
This four-pack of 8-tooth injection-molded sprockets comes with two idler sprockets and two sprockets with 7-mm holes.
$9.99
0-PL359 Injection-Molded Sprocket Set 8T GM <p><font color="00ff66" size="2" face="Arial, Helvetica, sans-serif">These 8-tooth, injection-molded sprockets are made to work with the rugged <a href="0-PL415.html" target="_top">miniature tank tracks</a>. This set comes with four sprockets made from sturdy, black ABS plastic: two sprockets for mounting on the 7-mm shafts of <a href="0-GM3.html" target="_top">224:1</a> and <a href="0-GM8.html" target="_top">143:1</a> gear motors, and two idler sprockets with 1/4in. holes that you can mount using shoulder bolts.</font></p>
Robot MarketPlace - Injection-Molded Sprocket Set 8T GM
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These 8-tooth, injection-molded sprockets are made to work with the rugged miniature tank tracks. This set comes with four sprockets made from sturdy, black ABS plastic: two sprockets for mounting on the 7-mm shafts of 224:1 and 143:1 gear motors, and two idler sprockets with 1/4in. holes that you can mount using shoulder bolts.
$9.99 
Miniature Track Link and Pin (pack of 10 links)
224:1 Gear Motor 90 Degree Shaft
143:1 Offset Shaft Gear Motor