What is the UCI rim depth limit for 2026?

The UCI limits rim height to 65 mm in road races from 1 January 2026. The UCI's statement reads: "The height of the rims of wheels used in road races will be limited to 65 mm from 1 January 2026."

Does the 65 mm rim limit apply to time trials?

The change was introduced for mass-start racing on safety grounds, and time-trial equipment is governed separately. If you are racing a time trial, confirm the current requirements with your federation or the race organiser rather than assuming the mass-start limit applies.

Are deep wheels now useless?

No. The limit applies to UCI road races. Time trials, triathlon, sportives and general riding are not governed by it, and a deeper rim remains faster on flat, sheltered roads. The rule narrows where a deep wheel can be raced, not whether it works.

Is rim depth the only wheel rule that matters?

No. UCI Article 1.3.018 requires tyre and rim combinations to comply with ISO 5775-1:2023 and ISO 5775-2:2021, which matters particularly on hookless rims where the tyre must be approved for hookless use and kept within the pressure limit.

Roadbook — sheet 05 · regulations

2026 UCI wheel rules explained

Since 1 January 2026 the UCI has capped rim height at 65 mm in road races. Of the 47 wheelsets in this index, 44 clear that limit on their published figures, 2 do not, and 1 sit close enough to need measuring.

Last reviewed 14 August 2026

What the rules say

Maximum rim height 65 mm

UCI · in force from 1 January 2026

From 1 January 2026 the UCI limits rim height to 65 mm in road races. Deeper rims remain available for other riding, and the limit does not describe time-trial equipment, which the UCI treats separately.

“The height of the rims of wheels used in road races will be limited to 65 mm from 1 January 2026.”

PRIMARY SOURCE · Union Cycliste Internationale · UCI statement on its recent decisions regarding changes to equipment regulations based on SafeR recommendations · read 14 August 2026

Tyre and rim compatibility (Article 1.3.018)

UCI · current requirement · depends on your setup

UCI Article 1.3.018 requires tyre and rim combinations to comply with ISO 5775-1:2023 and ISO 5775-2:2021. This is a rule about the combination you race on, not about the wheel on its own — so it depends on the tyre you fit.

“Article 1.3.018 of the UCI Regulations requires compliance with International Organisation for Standardisation (ISO) standards 5775-2:2021 and 5775-1:2023 in cycling competitions.”

PRIMARY SOURCE · Union Cycliste Internationale · Use of hookless rims with tubeless tyres: the UCI reminds riders of the rules to follow · read 14 August 2026

PRIMARY SOURCE · Union Cycliste Internationale · UCI Regulations, Part I — General Organisation of Cycling as a Sport · read 14 August 2026

What it rules out, from this index

Two things worth noticing. A wheelset is judged on its deepest rim, so a depth-mismatched pair can fail on the rear alone. And the limit is on height, not on the number in the model name.

Zipp 858 NSW
✕ NOT ELIGIBLE
Rim height is 82 mm, above the 65 mm limit.
Enve SES 6.7
✕ NOT ELIGIBLE
The deeper rim of the pair measures 67 mm, above the 65 mm limit.

Wheels that need measuring

The regulation limits rim height. A rim whose depth varies around its circumference — a sawtooth or undulating profile — is not cleared by a lower nominal figure if it peaks above the limit. Where such a rim sits on the limit, we flag it rather than wave it through.

Princeton CarbonWorks Wake 6560
! CHECK BEFORE RACING
Published height is 65 mm, but this rim's depth varies around its circumference. At the limit that needs measuring at its deepest point rather than taken from the nominal figure.

The deepest wheels you can still race

If the rule has sent you looking for the most rim you can legally line up on, this is the top of the index.

01UnverifiedCadex65 Disc65 mm · 22.4 int · 1,462 g · discaero / flatRRP £2,700
02UnverifiedReserve52|6352/63 mm · 24 int · 1,550 g · discaero / flatRRP £1,700
03UnverifiedRovalRapide CLX II51/60 mm · 21 int · 1,520 g · discaero / flatRRP £2,500
04UnverifiedZipp404 Firecrest58 mm · 23 int · 1,516 g · discaero / flatRRP £2,000

FILTER THE INDEX BY UCI ELIGIBILITY →

When a deeper wheel is still the right buy

A rule about racing is not a verdict on the equipment. The limit applies to UCI road races; most riding is not a UCI road race, and a deep rim did not get slower on 1 January.

Time trials. The change came in for mass-start racing on safety grounds, and time-trial equipment is governed separately. If you race against the clock, confirm the current requirements with your federation rather than assuming this limit applies to you.

Triathlon and non-UCI events. Triathlon is not run under UCI regulations, and neither are sportives, gran fondos or club time trials. Their organisers set their own equipment rules, which are frequently more permissive.

Riding that is not racing. On a flat, sheltered road at speed, a deeper rim is still faster. If you are never going to pin a number on, the only opinion that matters is whether you can handle it in a crosswind.

The practical read: if you race under UCI rules, buy inside the limit. If you do not, buy the wheel that suits your roads — and be aware that resale values on very deep wheels may soften as the racing market narrows.

Important

This is our reading of published UCI rules against published wheel specifications — not a ruling. National federations may vary requirements, race organisers may add their own, and the commissaire at your event decides. Check with them before you rely on it.

Rules last reviewed 14 August 2026 · we re-read the primary sources rather than relying on press coverage

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