Compatibility guide
The whole shop is built on one thing: knowing whether a part fits before you buy it. This page shows you how to check in about a minute, explains the three mount standards we publish on every listing, and lists plainly what crosses between a bike and an e-scooter — and what never will.
This is the number that lets one shop serve two vehicles. The grip section of a handlebar — the last 120 mm or so at each end, where your hands go — is 22.2 mm in diameter on virtually every bicycle sold and on virtually every commuter e-scooter.
It isn't a coincidence so much as inheritance: bicycle grip diameter was standardised decades ago, and scooter manufacturers adopted bicycle-standard bars because the parts already existed. The result is that anything which clamps to a grip section — lights, phone mounts, bells, horns, mirrors, baskets, cup holders — crosses straight over.
Where bars get thicker is in the middle, at the stem clamp. That's 25.4 mm or 31.8 mm on many bikes, and it's why some accessories ship with rubber shims. The shim widens a 22.2 mm clamp to fit a fatter section — it never makes a clamp smaller.
Measure your bar in a minute
You don't need calipers. A strip of paper and a ruler gets you an answer accurate enough for every product we sell.
The paper trick
Measuring circumference and dividing is far easier than trying to measure a diameter across a round tube by eye.
- 1Cut a strip of paperAbout 15 mm wide and 150 mm long. Receipt paper works well.
- 2Wrap it around the grip areaJust inside where your hand sits — not over the grip itself, and not on the thick middle section.
- 3Mark where it overlapsPinch it tight and mark the exact point the paper meets itself.
- 4Unroll and measure to the markThat length is the circumference. Compare it to the table below.
70 mm circumference is Ø22.2 mm, and that covers the overwhelming majority of everything we sell. Anything on the site marked Ø22.2 mm bar clamp will fit.
| Paper measures | Diameter | Where you'll find it | Our bar-clamp gear |
|---|---|---|---|
| ~70 mm | Ø22.2 mm7/8 inch | Grip section of nearly every bike and commuter e-scooter | Fits — no shim needed |
| ~80 mm | Ø25.4 mm1 inch | Older bike bars, some cruiser and BMX bars, mid-section | Fits with the included shim |
| ~100 mm | Ø31.8 mmOversized | Mid-section of most modern mountain, gravel and road bars | Fits with the included shim |
| ~110 mm+ | Ø35 mm and up | Aero road bars, some enduro bars, scooter stem poles | Use a strap-mounted item instead |
The three mount standards
Every product page states one of these. It is the single most useful line on the listing and it's why we put it above the price.
Ø22.2 mm bar clamp
A rigid ring that bolts around the grip section. The most secure option and the one that needs the measurement to be right.
- Lights and horns
- Phone mounts
- Bells and mirrors
- Baskets and cup holders
Silicone or velcro strap
Wraps and cinches. Doesn't care about the exact diameter, which is why it's the safest bet if you're unsure or if you swap between vehicles daily.
- Light sets
- Dry bags and stem bags
- Rear lights and trackers
- Lock brackets
Worn or carried by the rider
Never touches the vehicle at all. Automatically compatible with everything, including the vehicle you buy next.
- Helmets, gloves, pads
- Locks and chains
- Rain gear and overshoes
- Repair kits and multi-tools
Some products bolt to something only one vehicle has — rack eyelets, saddle rails, spokes, a brake rotor, a scooter deck. Those are labelled bike only or scooter only and never carry the fits-both badge. We'd rather lose that sale than have you find out at home with a screwdriver in your hand.
What fits my ride?
Answer what you know — leave anything you don't as "not sure" and we'll flag it rather than guess. This is the same check we run behind the fits-both badge.
Your vehicle
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The full matrix
Everything we sell, and why it does or doesn't cross over. No asterisks.
| Product | Bike | E-scooter | Why |
|---|---|---|---|
| Lights, bells, horns, phone mounts | Yes | Yes | Ø22.2 mm grip section is shared |
| Baskets and cup holders | Yes | Yes | Bar bracket — needs ~120 mm of clear bar |
| Bar-end mirrors and indicators | Check | Check | Needs an open bar end; many scooters are sealed |
| Bar bags, stem bags, dry bags | Yes | Yes | Strap fitting, no fixed diameter |
| D-locks, chains, cable locks, padlocks | Yes | Yes | Carried, not mounted |
| Helmets, gloves, pads, rain gear | Yes | Yes | Worn by the rider |
| Pumps, inflators, levers, sealant, tubes | Yes | Yes | A valve is a valve — tube size must match the tyre |
| Rear lights on a seatpost | Yes | Yes | Straps to a seatpost or a stem pole |
| Disc lock | Check | Check | Needs a brake rotor — not all scooters have one |
| Rear rack and pannier bags | Check | No | Needs threaded rack eyelets — scooters have none |
| Saddle bags | Yes | No | Straps to saddle rails |
| Wheel skewer locks | Check | No | Replaces a quick-release skewer |
| Frame ring lock | Check | No | Bolts to seat stays and passes through spokes |
| Spoke reflectors | Yes | No | Scooter wheels are solid or cast — no spokes |
| Clip-on mudguards | Yes | No | Clips to a fork crown and seatpost |
| Rear fender extender | No | Check | Bolts to an existing scooter fender |
| Frame pump | Check | No | Bracket mounts to bottle-cage bosses |
| Chain lube and chain tool | Yes | No | Most commuter scooters are hub-motor — no chain |
| Brake pads | Yes | No | Scooter calipers are usually proprietary |
| Deck grip tape | No | Yes | A bicycle has no deck |
The other three measurements
Bar diameter covers most of the shop. These cover the rest.
Tyre and tube size
It's printed on the sidewall of the tyre itself — you don't have to look it up. Read it exactly and match the variant.
- Bike, road or hybrid:
700 × 35c— rim size then tyre width - Bike, mountain:
26 × 1.95or27.5 × 2.1— inches - Scooter:
8.5 × 2.0or10 × 2.5— inches
Also check the valve: Presta is thin with a screw tip, Schrader is fat like a car tyre. Most scooters use Schrader.
Head circumference — helmets
Run a tape around your head about 2 cm above the eyebrows, at the widest point, and buy to that number.
- XS — 46 to 52 cm
- S — 52 to 56 cm
- M — 55 to 59 cm
- L — 58 to 62 cm
Between two sizes, take the smaller and open the dial. A helmet you can tighten fits better than one you can't.
Clear bar space
The constraint people forget. Everything competes for the same 200 mm either side of the stem — and on a scooter, far less once the display and throttle are in.
- Light or bell — about 40 mm
- Phone mount — about 60 mm
- Bar bag — about 100 mm
- Basket bracket — about 120 mm
Still not sure? Send a photo
Genuinely — this is the fastest path and it costs us nothing. Photograph your handlebar from above with the grip visible, or the tyre sidewall, and email it with what you're thinking of buying.
We'll tell you whether it fits before you spend anything. Two minutes of ours beats a return for both of us, and if we say it fits and it doesn't, we cover the postage back.
A clamp that needs persuading, a bracket held on with cable ties, a shim cut from a drink bottle — these fail, and they fail while you're moving. If something doesn't fit properly, send it back. It's returnable, and if our listing was wrong we pay the postage.
The same goes for load. A bar bracket rated to 5 kg means 5 kg, and most e-scooter manufacturers state a maximum total load that includes you plus everything you're carrying.
Common questions
Is 22.2 mm really the same on scooters?
On commuter scooters, yes, overwhelmingly — the bars came from the bicycle parts world. Performance and off-road scooters sometimes use fatter bars, which is why the guide asks you to measure rather than assume.
What's a shim and when do I need one?
A rubber sleeve that pads out a clamp to fit a thicker tube. Our bar-clamp products include them for 25.4 mm and 31.8 mm. Shims only ever go one way — you can't shim a clamp down to fit a thinner bar.
My scooter has a display in the middle of the bar. Does that matter?
It matters for space, not for diameter. Measure the clear run either side of the display and match it against the clear-bar-space panel above before you order anything wide.
Can I put a bike rack on my e-scooter?
No. Racks bolt to threaded eyelets on a bicycle frame and dropouts, and scooters have neither. Use a stem bag, a bar bag, a cargo net over the deck, or a backpack.
Will a bike helmet do for a scooter?
Yes — AS/NZS 2063:2020 is titled "helmets for use on bicycles and wheeled recreational devices", so it covers both. Some states require a motorcycle-standard helmet above certain scooter speeds; check your road authority.
What if the listing says it fits and it doesn't?
That's our error, not a change of mind. We pay the return postage and refund in full, with no 30-day limit. Say so when you contact us.