Boardman MTR 8.9 geometry and sizing

Source-linked frame measurements for the Current catalogue MTR 8.9, shown size by size without filling gaps or estimating values.

Full-suspension MTB · Current catalogue

4 measured sizes

Use these figures to compare frames, then confirm the current product table and test the complete bicycle. Component position and rider mobility are not captured by frame geometry alone.

Boardman MTR 8.9 Current catalogue geometry by size
Measurement	SM	MD	LG	XL
Recommended rider height	162–170 cm	168–177 cm	175–185 cm	183–195 cm
Recommended inside leg	72–82 cm	74–85 cm	78–89 cm	82–94 cm
Wheel size	29-inch	29-inch	29-inch	29-inch
Stack	602	610	620	629
Reach	440	460	480	500
Effective top tube	573	595	617	640
Seat tube	410	430	460	480
Head tube	100	110	120	130
Head angle	65.5°	65.5°	65.5°	65.5°
Seat angle	77.5°	77.5°	77.5°	77.5°
Chainstay	440	440	440	440
Fork offset	42	42	42	42
Bottom-bracket drop	33	33	33	33
Crank length	170	170	170	170
Stem length	45	45	45	45
Handlebar width	780	780	780	780

Using this entry

What changes through the size range

Front-end position

Stack and reach show how the head-tube reference point moves. A larger label does not imply that both values increase by the same amount.

Seated cockpit

Effective top tube, seat angle, stem length and saddle position affect how stretched the complete bike feels while seated.

Steering dimensions

Head angle and fork offset may stay fixed or change by size. Wheel and tyre radius are also needed before calculating trail.

Size recommendations

Height and inside-leg bands overlap deliberately. Riders near a boundary should compare both frames and assess control access, posture and intended riding.