Specialized Roubaix SL8 Sport 105

An all-round road bike from 2025, made in 8 sizes from 44 to 64.

Size

Stack 585 mmReach 381 mm

Geometry

Specialized Roubaix SL8 Sport 105 geometry by frame size
Size
Fit
Stack (mm)How high the front sits	543	549	566	585	605	630	665	685
Reach (mm)How far forward the bars start	353	363	370	381	389	397	403	409
Stack ÷ reach Higher = more upright	1.54	1.51	1.53	1.54	1.56	1.59	1.65	1.67
Top tube (effective) (mm)Horizontal top-tube length	498	520	532	549	568	584	600	618
Seat tube angle Saddle position over the pedals	75°	74°	74°	74°	73.5°	73.5°	73.5°	73°
Seat tube length (mm)Frame size reference	365	410	446	465	485	505	545	581
Head tube length (mm)Front-end height	90	90	105	122	140	168	202	222
Standover (mm)Clearance when you stop	686	719	747	766	787	809	847	865
Handling
Head tube angle Steeper = quicker steering	69.3°	70.8°	71.5°	72.3°	73°	73°	73.5°	73.5°
Fork offset (mm)Fork rake	52	52	52	47	47	47	47	47
Trail (mm)More = steadier steering	76	66	62	61	57	57	54	54
Wheelbase (mm)Longer = more stable	994	992	998	1005	1012	1031	1042	1054
Chainstay (mm)Shorter = snappier	418	418	418	420	420	423	423	423
BB drop (mm)More = lower centre of gravity	80	80	80	78	78	78	78	78
BB height (mm)Pedal clearance in corners	256	256	256	258	258	258	258	258
Front centre (mm)Room for your toes	589	587	593	598	604	620	631	634

Underlined values are calculated by BikeLens. A dash means the brand doesn't publish it.

Between race and comfort. A good fit for sportives, club rides and fast days out.

Size 54 is more upright than 89% of the 218 road frames we track.

The closest road frames from other ranges, against size 54 here.

Bikes with a similar fit, compared with size 54 of this bike
Bike	Size	Stack	Reach
Bianchi Infinito 105 DI22026Stack −1 mm, reach −4 mm	55	−1 mm	−4 mm
Kross ALTA 2.02026Stack +3 mm, reach +3 mm	L	+3 mm	+3 mm
Merida SCULTURA ENDURANCE GR 2002026Stack −1 mm, reach −1 mm	MD	−1 mm	−1 mm
Wilier Granturismo SLR2024Stack +1 mm, reach +3 mm	L	+1 mm	+3 mm
Cube Attain C:62 Race2026Stack +6 mm, reach +4 mm	56	+6 mm	+4 mm
Basso Astra2026Stack −9 mm, reach −1 mm	53	−9 mm	−1 mm

These builds share this exact geometry, so they fit the same.

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