I did a bunch of research to find the right size sprockets to convert from 630 to 530 chain on this bike. got a JTF339-17RB with the RB being a rubber cushion, opted for the rubber version at the last minute. The sprocket itself is the exact width of what I took off the bike, but the rubber makes it wider. Stock is 14.5mm at the hub, the new one is 14.5mm at the hub, but the rubber pushes it out to 18mm. Has anyone used on of these sprockets successfully, or should I order the one without the rubber? My "bike garage" isn't here otherwise I'd go slap it on and see if it clears, mainly concerned about behind the sprocket, there's plenty of clearance in front.