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Scott MacGregor
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Phone: (508) 695-3717
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USPD (Currie), Lashout, ElecTrec, & Rayos Drives
Setting up your chain for a custom sprocket set
NOTE 1: Your chain may be relatively new or well used. Since the amount of "chain stretch" effects how it fits the sprockets, your chain may require you to modify the instructions listed below.
NOTE 2:
Lashout, ElecTrec and Rayos bike drives have a chain slack adjustment feature not found on Currie drives. Before you alter your chain, try using this adjustment.
Motor / Wheel
15T and 60T -
This ratio (4.00:1) will produce a speed of about 11 MPH with lots of hill climbing power on a bike with a 26" wheel. In this case you must add an "offset", or "½" link along with its 2 master links to lengthen the chain. You may need to use one of my custom Delrin chain blocks to take up excess slack.17T and 60T -
This ratio (3.53:1) will produce a speed of about 13 MPH with good hill climbing power on a bike with a 26" wheel. Lengthen this chain in exactly the same way as the 15T-60T above. You may need to use one of my custom Delrin chain blocks to take up excess slack.19T and 60T -
This ratio (3.16:1) will produce a speed of about 15 MPH with better than stock hill climbing power on a bike with a 26" wheel. Lengthen the chain by adding 3 "holes" connected by 2 master links. This can be done with a 3 hole section of spare chain.19T and 54T -
This is the stock ratio of your bike drive (2.84:1) and will produce a speed of about 17 MPH.19T and 48T -
This ratio (2.53:1) will produce a speed of about 19 MPH with slightly reduced hill climbing power on a bike with a 26" wheel. You must reduce the chain length by removing 6 holes (3 links) & adding an "offset" link with 2 master links.21T/22T and 48T -
This ratio (2.18:1) will produce a speed of about 22 MPH with a bit less hill climbing power than 19T to 48T above on a bike with a 26" wheel. Remove 1 link from the stock chain. You will probably need one of my custom Delrin chain blocks to take up the excess slack.21T/22T and 54T - This ratio (2.45:1) will produce a speed of about 20 MPH with a bit less climbing power than 19T to 54T on a bike with 26" wheels. You will need to remove 1 link (2 holes) and install an offset link with 2 master links.