Radon R1 Disc (2026)

road · aluminium · sizes 50–63 · tyres up to 30 mm Manufacturer’s website

Geometry ?

Radon R1 Disc 2026 geometry in sizes 50–63: stack 528–611 mm, reach 379–423 mm, head angle 71–73°.

	50	53	56	58	60	63
Stack	528 mm	546 mm	562 mm	576 mm	592 mm	611 mm
Reach	379 mm	384 mm	389 mm	400 mm	409 mm	423 mm
Head angle	71°	72°	72.5°	72.5°	73°	73°
Seat angle	74.5°	74°	74°	73.5°	73°	73°
Seat tube (c-t)	460 mm	495 mm	530 mm	555 mm	575 mm	615 mm
Head tube	130 mm	145 mm	160 mm	175 mm	190 mm	210 mm
Top tube (effective)	525 mm	540 mm	550 mm	570 mm	590 mm	610 mm
BB drop	71 mm	71 mm	71 mm	71 mm	71 mm	71 mm
Chainstay	415 mm	415 mm	415 mm	415 mm	415 mm	415 mm
Wheelbase	992 mm	994 mm	1000 mm	1015 mm	1024 mm	1044 mm
Stock build by size
Cranks	170 mm	172.5 mm	172.5 mm	175 mm	175 mm	175 mm
Stem	90 mm	90 mm	100 mm	100 mm	120 mm	120 mm
Bar width	400 mm	420 mm	440 mm	440 mm	460 mm	460 mm

Source: radon-bikes.de, checked 3 Nov 2026 · bar position: worked out from published data

Stock build

R1 Tiagra €1,199

R1 105 €1,499

Source for all builds: radon-bikes.de, checked 3 Nov 2026

Frames with similar geometry

Stack and reach within 12 mm of size 58 (stack 576 / reach 400 mm).

Spotted a mistake or a missing build? Let me know.

Are you the manufacturer, or do you sell this bike? I’m missing 2 values for this model’s stem and bars. Add them