There are several makers of aluminum sprocket adapters. Check some of the vendors who advertise here. To my knowledge they all utilize the three bolt mounting system but they also require a 36 spoke rim configuration.
When ordering a hub/sprocket adapter keep in mind that you must have an accurate measurement of your rear hub diameter. 'Almost' won't do it. The adapter must be made to fit your hub. More precisely, your hub must fit their adapter. Use a caliper and get the measurement down to the thousands of an inch and make sure the adapter you order is made to fit that measurement.
Tom
When ordering a hub/sprocket adapter keep in mind that you must have an accurate measurement of your rear hub diameter. 'Almost' won't do it. The adapter must be made to fit your hub. More precisely, your hub must fit their adapter. Use a caliper and get the measurement down to the thousands of an inch and make sure the adapter you order is made to fit that measurement.
Tom
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