absoluteBLACK Direct Mount Narrow Wide Chainring - SRAM Direct Mount - 3mm Boost - Oval - Black - 12 Speed Shimano - 30T PLP|Model Year The engineered foam insert mounts

The engineered foam insert mounts inside a mountain bike tire and divides the inner volume of the tyre in half

Can't use the air release button to fine-tune air pressures when used with Presta valves

It folds for storage and tilts for rear door access

Tired of unforeseen seat post service

absoluteBLACK Direct Mount Narrow Wide Chainring - SRAM Direct Mount - 3mm Boost - Oval - Black - 12 Speed Shimano - 30T PLP|Model Year The engineered foam insert mountsabsoluteBLACK is dedicated to producing the world's finest oval chainrings and were the first to crack the code to discover the correct shape and 'clocking' to make an oval chainring work. They learned how to maximize the part of the stroke where power is produced and minimize resistance where it isn't. The oval shape smooths the delivery of power throughout the pedal stroke and improves efficiency and energy conservation. Many other brands have