Oakley Elements Vest - S - Blackout YGroup_7033881985069 The effective rim diameter is

The effective rim diameter is where they differ:

For MTB riding

Powerglide Technology

A ‘pencil’ style frame bag that tightly hugs the tubes of the bike to hold heavy equipment in a low position while also helping protect the frame

This insert is a lightweight solution perfect for trail

Oakley Elements Vest - S - Blackout YGroup_7033881985069 The effective rim diameter isWelcome to your new go to piece of gear that will quickly become an essential part of your kit. The men's Elements Vest is the all around layer that repels water and cooling with their signature OProtect DWR finish and quick drying fabric. We added a touch of spandex for four way stretch, so you can keep your core warm without adding bulk. A two way autolocking, branded puller keeps the zip where you want it, while elastic binding at the cuffs and hem