104 BCD Drop-Stop Oval Chainring - Shimano Hg+ Chains Breather Valve

Breather Valve

Shimano BR-M9000 Metal Pad & Spring J04C w/Fin

For example

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104 BCD Drop-Stop Oval Chainring - Shimano Hg+ Chains Breather Valve104 BCD is the most common bolt pattern on double and triple cranksets and happens to be the first product ever made by Wolf Tooth Components. The Drop Stop tooth design is the best performing on the market, with exceptional durability. Drop Stop technology: On Wolf Tooths patented wide narrow chainring, the wide side of the tooth has maximum contact on the drive side which spreads the load and improves chainring life. The narrow side allows clearance