Topeak TetraRack M2 BF PSI 2 is a go/no-go gauge

2 is a go/no-go gauge designed to accurately indicate when a chain reaches 0

and stiffness

progressiveness and braking power

and durability of tubular titanium construction

Unlike traditional syrup-based energy gels

Topeak TetraRack M2 BF PSI 2 is a go/no-go gaugeThe perfect quick mount rear rack system attaches to MTB full suspension seatstays or hardtail MTB without rack eyelets. This one size fits all rear rack features an innovative top plate that adjusts to level independent of the seatstay angle. Integrated QuickTrack system allows Topeak TrunkBags to slide and lock into place and release with a the push of a button. Innovative hook and loop strap mounting system cinches down tight to keep the load