Surly

Steamroller

current (no model year stated) ／ steel

Drawn from the table

Not photographs — each outline is generated from this frame’s own published figures, all at the same scale, so a bigger size is bigger on screen by exactly as much as it is in life.

Size	49	53	56	59	62
Seat tube	515 mm	555 mm	585 mm	615 mm	645 mm
Top tube	528 mm	546 mm	568 mm	588 mm	609 mm
Head tube	83 mm	109 mm	136 mm	163 mm	196 mm
Head angle	72.5 °	73 °	73.5 °	74 °	74 °
Seat angle	74.5 °	74 °	73.5 °	73 °	73 °
Chainstay	398 mm	398 mm	398 mm	398 mm	398 mm
Wheelbase	957 mm	967 mm	979 mm	988 mm	1008 mm
BB drop	70 mm	70 mm	70 mm	70 mm	70 mm
BB height	275 mm	275 mm	275 mm	275 mm	275 mm
Standover	754 mm	784 mm	812 mm	839 mm	869 mm
Fork axle-to-crown	375 mm	375 mm	375 mm	375 mm	375 mm
Stack	505 mm	531 mm	559 mm	586 mm	618 mm
Reach	388 mm	394 mm	403 mm	408 mm	420 mm
Fork rake	38 mm	38 mm	38 mm	38 mm	38 mm

Brakes and cables

Rear brake mount

yes

Front brake mount

yes

Cable routing

external

“Not stated” means we found no statement from the maker. It is not a confirmation that the frame lacks the mount.

How this table was measured

Seat tube: not stated ／ Top tube: effective (horizontal)

All values are in millimetres. Some manufacturers publish centimetres; the conversion happens once, when the chart is transcribed.

Not published by this manufacturer: Front centre. Other makers publish these; we do not estimate them.

Checked 2026-08-17 ／ source 1

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