One-size-fits-all aluminum tubular rear rack equipped with adjustable legs to fit most 24? to 29? wheel MTB and 700C touring bikes with disc brakes MTX QuickTrack plate is compatible with any Topeak MTX TrunkBag, MTX rear basket, and most other rack packs and panniers on the market 6061 T6 aluminum construction with stainless steel hard-ware, 3-point adjustable extenders Backwards compatible with all original (1.0) MTX accessories