Menu

Shortlist · Mounts

Phone, computer and light mounts with a stated bar range

Bike phone, computer and light mounts whose makers state the bar diameters and devices they fit. Measure your bar, match the interface, then choose.

By Watchmarks EditorialPublished Research-based

We may earn a commission if you buy through links on this page. How we make money

Short answer

For a phone, the SP Connect bike mount: SP Connect lists bars and stems of about 20-44 mm, with flat and round adapters included.[1] For a CatEye light, the H-34N bracket, listed for 22-35 mm bars.[2] For a Wahoo BOLT 3 or ROAM 3, Wahoo's own out-front mount, for 31.8 mm round bars only.[3]

How we chose

A mount is on this list only if:

  1. Its maker states the bar or stem diameters it fits. We give the range as the maker states it. Quad Lock, for comparison, designs its Handlebar/Stem Mount for 25-40 mm.[4] A range is the maker's statement for round tubes, not a promise for every bar shape.
  2. Its maker names the interface or devices. Computer mounts are not interchangeable across brands: Wahoo says its ELEMNT, BOLT and ROAM computers do not work directly with Garmin mounts.[5] CatEye names the lights its H-34N supports and says AMPP models with rubber strap mounts are not compatible.[2]
  3. It comes from the device's or mount's own maker, sold on Amazon. Check "Ships from / Sold by" on each.

We have verified the stated ranges for the first three picks. For the Garmin, K-Edge, Magicshine and ROCKBROS mounts, we have not yet checked their makers' figures, so each pick says what to confirm.

Phone mount with the widest stated range

SP Connect Universal Bike Mount (phone, 20‑44 mm bars and stems)

Universal Bike Mount (mount only, case sold separately)

Phone users on bars or stems from about 20 to 44 mm

Why it's here
SP Connect lists tool-free attachment to handlebars or stems of about 20-44 mm, with one flat and one round diameter adapter included.
Watch out
It holds the phone only through an SP Connect case or adapter, sold separately, and SP Connect's page does not say which case generation it uses. On Amazon, check that 'Ships from / Sold by' shows Amazon.com or SP Connect.
Valve compatibility
Not stated
Mount diameter
20-44
Inflation time (measured)
Not stated
Runtime (measured)
Not stated

Values are the manufacturer's specs unless marked.

Light bracket for CatEye headlights

CatEye H‑34N FlexTight headlight bracket (22‑35 mm)

H-34N FlexTight bracket

CatEye light owners replacing or adding a bracket

Check price on Amazon
Why it's here
CatEye lists the H-34N for 22-35 mm handlebars, attaching without tools, and names the AMPP, GVOLT, Sync Core, GE100 and HL-EL160/135 lights it supports.
Watch out
CatEye says AMPP models with rubber strap mounts are not compatible, and it is for CatEye lights only. On Amazon, check that 'Ships from / Sold by' shows Amazon.com or CatEye.
Valve compatibility
Not stated
Mount diameter
22-35
Inflation time (measured)
Not stated
Runtime (measured)
Not stated

Values are the manufacturer's specs unless marked.

Out-front mount for Wahoo BOLT 3 and ROAM 3

Wahoo ELEMNT ROAM 3 and BOLT 3 out-front mount (31.8 mm)

Out-front mount for ROAM 3 and BOLT 3

BOLT 3 or ROAM 3 owners with 31.8 mm round bars

Check price on Amazon
Why it's here
Wahoo's own out-front mount for the BOLT 3 and ROAM 3, for 31.8 mm round bars.
Watch out
31.8 mm round bars only. Wahoo says legacy flanged BOLT and ROAM units do not fit it, and warns that over-torquing can strip its threads. On Amazon, check that 'Ships from / Sold by' shows Amazon.com or Wahoo.
Valve compatibility
Not stated
Mount diameter
31.8
Inflation time (measured)
Not stated
Runtime (measured)
Not stated

Values are the manufacturer's specs unless marked.

Out-front mount for Garmin computers

Garmin Out-Front Bike Mount (quarter-turn, for Edge computers)

Out-Front Bike Mount

Garmin Edge owners

Check price on Amazon
Why it's here
Garmin's own out-front mount for its Edge computers.
Watch out
We have not yet verified Garmin's bar sizes or device list for it, so check both on Garmin's page. Wahoo says its ELEMNT, BOLT and ROAM do not work directly with Garmin mounts. On Amazon, check that 'Ships from / Sold by' shows Amazon.com or Garmin.
Valve compatibility
Not stated
Mount diameter
25.4, 26, 31.8, 35
Inflation time (measured)
Not stated
Runtime (measured)
Not stated

Values are the manufacturer's specs unless marked.

Garmin computer mount with a light mount below

K-Edge Max XL Combo mount for Garmin, 31.8 mm (computer plus GoPro-style mount below)

Max XL Combo, Garmin, 31.8 mm, black

Garmin users who want a computer and light on one out-front mount

Why it's here
K-Edge's Max XL Combo for Garmin in the 31.8 mm clamp size, which adds a mount underneath for a light or camera.
Watch out
We have not yet verified K-Edge's figures. Choose the 31.8 mm version only for 31.8 mm bars; it is for Garmin computers, not Wahoo. On Amazon, check that 'Ships from / Sold by' shows Amazon.com or K-Edge.
Valve compatibility
Not stated
Mount diameter
31.8
Inflation time (measured)
Not stated
Runtime (measured)
Not stated

Values are the manufacturer's specs unless marked.

Out-front mount for Magicshine lights

Magicshine MJ‑6272 aluminium out-front mount (GoPro interface)

MJ-6272 out-front mount

Magicshine light owners who want the light under an out-front mount

Check price on Amazon
Why it's here
Magicshine's MJ-6272 out-front mount, for Magicshine lights that hang under a mount, such as the EVO 1300.
Watch out
We have not yet verified Magicshine's bar range and light list for it, so check both on Magicshine's page. On Amazon, check that 'Ships from / Sold by' shows Amazon.com or Magicshine.
Valve compatibility
Not stated
Mount diameter
31.8-35
Inflation time (measured)
Not stated
Runtime (measured)
Not stated

Values are the manufacturer's specs unless marked.

Clamp phone holder without a special case

ROCKBROS aluminium bike phone holder, handlebar clamp (4.7‑7.1 in phones)

Handlebar clamp version

Commuters who want a phone mount without buying a new case

Check price on Amazon
Why it's here
A ROCKBROS phone holder that clamps the phone itself, for riders who do not want a brand-specific case.
Watch out
We have not yet verified ROCKBROS's bar sizes and phone sizes, so check both. Choose the handlebar-clamp version. We could not verify a current ROCKBROS marketplace store. On Amazon, check that 'Ships from / Sold by' shows Amazon.com or ROCKBROS.
Valve compatibility
Not stated
Mount diameter
22.2, 25.4, 31.8
Inflation time (measured)
Not stated
Runtime (measured)
Not stated

Values are the manufacturer's specs unless marked.

Before you order

  • Measure the clamp spot. Bars change diameter along their length. See how to measure your handlebar diameter.
  • Torque. Wahoo says only minimal torque is needed for its out-front mount and warns that over-torquing can strip its threads.[3] We give no torque numbers; follow each maker's instructions.
  • Phone cameras. Apple's note on vibration and iPhone cameras covers motorcycles, mopeds and scooters and does not mention bicycles.[6] We make no claim either way.

Next

Questions

Which mount fits a 35 mm bar?

Among these, SP Connect lists about 20-44 mm and CatEye lists 22-35 mm for its light bracket. Wahoo's out-front mount is for 31.8 mm round bars only.[1][2][3]

Can I put a Wahoo on the Garmin mount?

Not directly. Wahoo says its ELEMNT, BOLT and ROAM computers do not work directly with Garmin mounts.[5]

Will a phone mount hurt my phone's camera?

We cannot say either way. Apple's vibration note covers motorcycles, mopeds and scooters and does not mention bicycles.[6]

Sources and changes

  1. Universal Bike Mount (SP Connect) · Manufacturer · SP Connect store product page, SKU 53342: bar/stem diameter range and included adapters. · checked 14 Oct 2026
  2. H-34N Bracket for Headlights [5338827N] (CatEye) · Manufacturer · CatEye bracket product page: bar range, supported lights, exclusions. · checked 14 Oct 2026
  3. Mount an ELEMNT ROAM 3 or BOLT 3 (Wahoo Fitness) · Manufacturer · Wahoo support article (API rendering of article 26479506087058): BOLT 3/ROAM 3 mount interface, legacy mount fit, third-party testing statement. · checked 14 Oct 2026
  4. Handlebar/Stem Mount (Quad Lock) · Manufacturer · Quad Lock support article (Help Center API rendering of https://support.quadlockcase.com/hc/en-us/articles/6880481474063-Handlebar-Stem-Mount): diameter range, mounting hardware, adaptors, dampener compatibility. · checked 14 Oct 2026
  5. ELEMNT, BOLT, and ROAM FAQ (Wahoo Fitness) · Manufacturer · Wahoo support FAQ (API rendering of article 17977572935442): Garmin mount compatibility. · checked 14 Oct 2026
  6. Exposure to vibrations, such as those generated by high-powered motorcycle engines, may impact iPhone cameras (Apple) · Manufacturer · Apple support note on vibration effects on iPhone OIS and closed-loop AF; motorcycles, mopeds, scooters. · checked 14 Oct 2026
  7. Company Milestones (ROCKBROS) · Manufacturer · Corporate history including marketplace and retail milestones. · checked 14 Oct 2026
  • : First published.

Next editorial review due 13 Jan 2027.