Sanderson Blitz 650 MTB Bike Frame Orange/Grey 16 27.5. This Sanderson Blitz MTB frame has some cosmetic damage from storage, it is otherwise new and unused. Supplied parts as per images, no additional parts supplied. Trail hard tail frame for – 27.5 wheel 140mm fork. TOP TUBE EFFECTIVE (HORIZONTAL) 576mm. TOP TUBE EFFECTIVE (inches) 22.68. SEAT TUBE (CENTER TO TOP) 406mm. SEAT TUBE ANGLE 70 Degrees. HEAD ANGLE 67 Degrees. BB DROP (AXLE TO BB DISTANCE) 25mm. HEAD TUBE LENGTH 115mm. CHAINSTAY LENGTH (RC) 430mm. SEAT POST 31.6mm. Headset : EC34/EC44 – suitable for taper steerer forks. BB : English Threaded 73mm with ISCG-05 tabs. Seat post : 31.6mm. Seat Clamp : 34.9mm. Rear dropouts : 135mm QR.