Can I ride the Transiro Hydra without socks?

That is what it is designed for. Fizik says the 3D air-mesh upper is highly breathable to avoid overly sweaty feet and calls it an optimal solution for athletes who race sockless. The single Velcro strap is there for fast, worry-free transitions.

Transiro Hydra or Transiro Hydra Aeroweave Carbon?

They share the single-strap tri closure but not the sole or the upper. The Transiro Hydra has a 3D air-mesh upper and the R5 nylon sole (stiffness index 6). The Hydra Aeroweave Carbon has a woven Aeroweave upper and the carbon R2 sole, which Fizik rates 10 and calls the most responsive in its range. Fizik lists both at 233 g. We stock the Transiro Hydra.

How stiff are Fizik’s Tempo and Transiro soles?

Fizik rates each sole on a stiffness index where higher is stiffer. Here: the R5 nylon composite sole (Tempo Powerstrap R5, Tempo Artica GTX, Transiro Hydra) is 6, the R4 carbon-injected nylon sole (Tempo Overcurve R4 and R4 Wide) is 7 and the full-carbon R3 (Tempo Decos Carbon) is 10. Fizik describes the R5 as supple and comfortable over long distances, the R4 as a balance of comfort and pedalling efficiency, and the R3 as a stiff sole for optimal power transfer.

Why does Fizik set the cleat further back?

On its newer soles — the R3 of the Decos Carbon, the R4 of the Overcurve R4 and the redesigned R5 of the Artica GTX and Transiro Hydra — Fizik places the cleat slightly further towards the heel than traditional placement. Fizik says this improves pedalling efficiency and reduces knee compression, especially in aggressive, forward aero positions. If you are coming from another shoe, re-check your cleat set-up rather than copying the old position.

Which size of Fizik road shoe should I buy?

Measure your foot from heel to longest toe and look the length up in Fizik’s size guide, which maps foot length to EU, US and UK sizes — 270 mm is EU 42, 277 mm is EU 43. Every Tempo and Transiro model uses the same table, Wide versions included: Wide adds volume, not length. Fizik makes half sizes; we stock whole EU sizes.

FIZIK TRANSIRO HYDRA Cycling Shoes

BLACK

€159,99

~~€159,99~~ €159,99

Tax Included
EU Destination Selected (Spain)

Out of stock

Available from ~27 Nov 2026

The essentials

Best for

Triathlon
Sockless racing
Hot weather

FIZIK TRANSIRO HYDRA Cycling Shoes - BLACK

Technologies

Specifications

Closure	1 Velcro strap
Sole	R5, nylon composite
Stiffness index	6
Weight	233 g (Fizik)
Upper	3D air mesh
Fit	Regular
Cleat system	Road clipless
Sizes	EU 38–47 (whole sizes)

Quick transitions

Fizik treats transitions as triathlon’s fourth discipline: the Hydra closes with a single Velcro strap for fast, worry-free changes, and the enveloping strap gives the foot support needed to stay efficient in every race situation.

3D air mesh

The upper is 3D air-mesh fabric, highly breathable to avoid overly sweaty feet; Fizik calls it an optimal choice for athletes who race sockless.

R5 outsole

The redesigned nylon R5 outsole offers comfort and moderate stiffness (index 6). The cleat is set slightly further back than traditional settings to improve efficiency and reduce knee compression, and a wide vent inlet brings in cooling air.

FIZIK TRANSIRO HYDRA Cycling Shoes - BLACK

Compare with

	FIZIK TRANSIRO HYDRA Cycling Shoes - BLACKThe Transiro Hydra is Fizik’s triathlon bike shoe for fast, simple transitions: a single Velcro strap, a highly breathable 3D air-mesh upper that Fizik calls ideal for racing sockless, and a moderately stiff R5 nylon sole (index 6) at 233 g.	FIZIK Road Cycling Shoes Tempo R5 Powerstrap - Black Choose the Tempo Powerstrap R5 for a simple two-strap Velcro road shoe, with instep and midfoot set separately and a comfortable R5 nylon sole (index 6).	FIZIK Road Cycling Shoes Tempo Decos Carbon - White/White Choose the Tempo Decos Carbon for a full-carbon R3 sole at stiffness index 10, a bi-directional BOA Li2 dial and 205–218 g by Fizik’s figures.
Regular price	€159,99	€125,99	€216,99
Safety rating	—	—	—
Closure	1 Velcro strap	Powerstrap, 2 Velcro straps	1 × BOA Li2 (bi-directional)
Sole	R5, nylon composite	R5, nylon composite	R3, full carbon
Stiffness index	6	6	10
Weight	233 g (Fizik)	255 g (Fizik)	205–218 g (Fizik)
Upper	3D air mesh	PU	PU-laminated mesh
Fit	Regular	Regular	Regular
Cleat system	Road clipless	Road clipless	Road clipless
Sizes	EU 38–47 (whole sizes)	EU 41–47 (whole sizes)	EU 38–47 (whole sizes)

FIZIK TRANSIRO HYDRA Cycling Shoes - BLACK

Size guide

EU	US	UK	Foot length (cm)	Foot length (in)
36	4 ¼	3 ¼	23	9.1
37	5 ¼	4 ¼	23.7	9.3
37.5	5 ½	4 ½	24	9.4
38	6	5	24.35	9.6
38.5	6 ¼	5 ¼	24.7	9.7
39	6 ¾	5 ¾	25	9.8
39.5	7	6	25.35	10.0
40	7 ½	6 ½	25.7	10.1
40.5	8	7	26	10.2
41	8 ¼	7 ½	26.35	10.4
41.5	8 ¾	7 ¾	26.7	10.5
42	9	8	27	10.6
42.5	9 ½	8 ½	27.35	10.8
43	9 ¾	8 ¾	27.7	10.9
43.5	10	9	28	11.0
44	10 ¾	9 ¾	28.35	11.2
44.5	11	10	28.7	11.3
45	11 ½	10 ½	29	11.4
45.5	11 ¾	10 ¾	29.35	11.6
46	12	11	29.7	11.7
46.5	12 ½	11 ½	30	11.8
47	13	12	30.35	11.9
48	13 ¾	12 ¾	31	12.2

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.

Find your size with a shoe you already own

Tell us a cycling shoe that fits you well and the size you wear in it. We compare the brands’ official foot-length charts.

Brand of the shoe you own Size you wear (EU)

An estimate from each brand’s official size chart. Width, volume and the last also change the fit — if in doubt, ask us.

Description

The Transiro Hydra is Fizik’s triathlon bike shoe for fast, simple transitions: a single Velcro strap, a highly breathable 3D air-mesh upper that Fizik calls ideal for racing sockless, and a moderately stiff R5 nylon sole (index 6) at 233 g. It is for triathletes who value comfort and quick changes over the last bit of stiffness; road riders who don’t do transitions are better served by a two-strap or dial shoe.

Single Velcro strap for fast, worry-free transitions — Fizik calls transitions triathlon’s fourth discipline
3D air-mesh upper, highly breathable and suited to racing sockless, per Fizik
Redesigned R5 nylon sole, stiffness index 6, with a wide vent inlet
Cleat set slightly further back for efficiency and less knee compression in aero positions; Fizik lists 233 g

Available sizes