You’d think this would be a simple story…Wolf Tooth makes narrow-wide chainrings and now they work with SRAM’s T-Type Transmission groups. And it is, but it isn’t.
The Wolf Tooth Drop-Stop B chainrings were introduced when SRAM introduced their road Flat Top chains. The tooth profile changed slightly, making the wide teeth slightly less wide so they fit in between the outer chain plates better with less rubbing. They also increased the roller pocket diameter for the Flat Top MTB chains, because those chains have slightly larger diameter rollers. This lets the chain fully drop in between the teeth, and keeps the roller resting on the load-bearing portion of the tooth rather than bottom out and not fully engaging.
Now, they’re adding mountain bike-sized Drop-Stop B chainrings with the SRAM 8-bolt direct mount pattern, which will have the proper 3mm and 0mm offsets… Which chainring offset do you need?
SRAM’s DUB WIDE spindles are what come with the new Transmission groups, which use a 3mm offset chainring to achieve a 55mm offset. For most riders, that means you’ll buy the 3mm offset chainring to match things up. But just in case you’re using a different crankset, use the chart above to check what you need…because there’s a narrower 52mm chainline XX SL spindle for racers that would use a 0mm offset to achieve the desired 55mm chainline.
Confused yet? It’s not Wolf Tooth’s fault, it’s the way the bike industry has named the standard. The chain LINE offset is measured from the […]
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