Do Shimano shoes run small, and what does Wide mean?

Shimano's own advice: cycling shoes are meant to be form-fitting and on the snug side, so if you are between sizes, size up. Measure your foot length standing with your heel against a wall and use the chart in the size guide. Wide sizes keep the same length and sole but add roughly 9–10 mm of circumference around the ball of the foot — the answer if the length is right but the forefoot pinches.

S-PHYRE RC903 or RC903 PWR?

Shimano builds the PWR for track racers, sprinters and time triallists. It swaps the RC903's two low-profile BOA Li2 dials for a Li2 metal dial with a power boost guide plus a Velcro toe strap, and uses a reinforced surround upper with a tongue for a glove-like, more rigid hold. Both share the anti-twist heel cup. If you ride long road days rather than sprint, the standard RC903 is the more comfortable choice.

S-PHYRE RC903 or RC703?

Shimano says the RC703 uses the same S-PHYRE fit technology as its pro road shoes, with a low stack height midsole, Power Zone lace guides and dual BOA L6Z dials. The RC903 steps up to two low-profile BOA Li2 dials, the anti-twist heel cup and a micro-fibre leather upper. The RC703 also comes in wide sizes from 40 to 50, which is often what decides it.

SHIMANO Sphyre RC903 Wide Road Cycling Shoes

Black

€379,99

Tax Included
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Technologies

Best for

Road racing
Fast group rides
Long road days

SHIMANO Sphyre RC903 Wide Road Cycling Shoes - Black

Technologies

Specifications

Closure	2 × BOA Li2
Sole	Carbon
Cleat system	SPD-SL
Sizes	EU 39–48 + Wide 47

Streamlined heel cup

A smoothly integrated heel cup with Shimano's anti-twist stabiliser built inside it.

Low-profile lace guide

A slim lace guide that keeps the top of the foot clean and uncluttered.

Airy synthetic leather

A thin, breathable synthetic leather upper that Shimano uses to save grams for pro-level racing.

Dual BOA Li2 dials

Two low-profile BOA Li2 dials for a micro-adjustable, precise fit, which Shimano says is built for tough conditions.

360° wrapping upper

The upper surrounds the whole foot like a supportive cocoon; Shimano credits it for fit, stability and low weight.

Shimano's stiffest sole

DYNALAST carbon-fibre sole at stiffness level 12, the top of Shimano's scale.

DYNALAST

Shimano's cycling-specific last, the form that sets the shoe's shape and volume. Shimano says it secures the foot to reduce power loss at the pedal and fatigue on long rides, while an optimised toe spring reduces tension in the feet, calves and hamstrings. The Wide version adds volume around the ball of the foot on the same sole.

SHIMANO Sphyre RC903 Wide Road Cycling Shoes - Black

Compare with

	Shimano S-PHYRE RC903Shimano's road race shoe, which it calls the culmination of its most advanced technologies.	Shimano S-PHYRE RC903 PWR Choose it for sprinting and track: Li2 metal dial with power boost guide, Velcro toe strap, reinforced upper.	Shimano RC703 Choose it for S-PHYRE fit technology at a lower price, with dual BOA L6Z dials and wide sizes 40–50.
Regular price	€379,99	€279,00	€199,29
Safety rating	—	—	—
Closure	2 × BOA Li2	BOA Li2 + velcro	2 × BOA L6Z
Sole	Carbon	Carbon	—
Cleat system	SPD-SL	SPD-SL	SPD-SL
Sizes	EU 39–48 + Wide 47	EU 38–47	EU 39–48 + Wide 41–47

Shimano S-PHYRE RC903

Size guide

EU	US	Foot length (cm)	Foot length (in)
38	5–5.5	23.8	9.4
38.5	5.5–6	24.2	9.5
39	6	24.5	9.6
39.5	6.5	24.9	9.8
40	7	25.2	9.9
40.5	7.5	25.5	10.0
41	7–7.5	25.8	10.2
41.5	8	26.2	10.3
42	8.5	26.5	10.4
42.5	8.5–9	26.9	10.6
43	9	27.2	10.7
43.5	9.5	27.5	10.8
44	10	27.8	10.9
44.5	10–10.5	28.2	11.1
45	10.5	28.5	11.2
45.5	11	28.9	11.4
46	11–11.5	29.2	11.5
46.5	11.5	29.5	11.6
47	12	29.8	11.7
48	12.5	30.5	12.0

Shimano: cycling shoes are meant to be form-fitting and on the snug side — if between sizes, size up. Wide sizes keep the same length but add about 9–10 mm of circumference around the ball of the foot.

How to measure

Stand on a sheet of paper with your heel against a wall, mark the tip of your longest toe and measure the distance in centimetres. Measure both feet and go by the longer one.

Size EU 410 EU 420 EU 430 EU 440 EU 450 EU 460 EU 470

Description

The Wide version of Shimano's S-PHYRE RC903 road race shoe, built on a wider last for riders with broader feet. Everything else is the standard RC903: two low-profile BOA Li2 dials for quick micro-adjustment, a sole built for optimum stiffness, an anti-twist heel cup for explosive efforts and a perforated micro-fibre leather upper.

Wider last than the standard RC903 for broader feet
Dual low-profile BOA Li2 dials for quick, precise micro-adjustment
Anti-twist heel cup stabilises the heel under explosive acceleration
Lightweight micro-fibre leather upper with perforated venting; SPD-SL compatible

Available sizes