Chains are getting thinner, to accomodate 11 and 12speeds. However we also have 3/32" and 1/8" chains because they are strong. We stock IZUMI chains from Japan.
We also stock Gates Carbondrive CDX belts in the ratios that will run on our bikes.
For silent running and 1000's of maintenance free miles - look no further than GATEs CDX Belts , Sprockets and Pulleys.