Independent comparisons. We may earn from shop links. More info

What size wheelbarrow wheel you actually need

Updated: 16.10.2026

You have a perished tyre in one hand and a listing that says 14 inch, universal, and 3.50-8 in the other, and the numbers do not agree. What size wheelbarrow wheel you need is five figures: overall diameter, tyre code, axle bore, hub length, and the gap between the brackets. A listing that skips them is a question, not an answer. The nine amazon.co.uk captures behind the examples were taken on 15 October 2026 and sit on the [wheelbarrow wheel comparison](/hub/garden-tools/wheelbarrow-wheel). The figures follow the Titan Pro measuring notes and UK trade pages for reducers. No British Standard for a barrow wheel was identified, so none is invented.

You have a perished tyre in one hand and a listing that says 14 inch, universal, and 3.50-8 in the other, and the numbers do not agree.

Our top picks

KetoPlastics KetoPlastics 14 inch foam-filled wheel with axle, 3.50-8

Best overall

KetoPlastics KetoPlastics 14 inch foam-filled wheel with axle, 3.50-8
8.3/10about £17.99
View offer
Crystals Crystals 14 inch 4.00-6 wheel, 25 mm bore with reducers

Alternative

Crystals Crystals 14 inch 4.00-6 wheel, 25 mm bore with reducers
4.8/10about £19.99
View offer
TMZ TMZ 14 inch pneumatic wheel, 3.50-8, 25.4 mm bore

Best value

TMZ TMZ 14 inch pneumatic wheel, 3.50-8, 25.4 mm bore
7.2/10about £9.68
View offer
On this page
  1. 1.Tyre code and overall diameter
  2. 2.Axle bore, reducers, and bearings
  3. 3.Hub length and the bracket gap
  4. 4.Measure in this order
  5. 5.Read a listing in one minute

Tyre code and overall diameter

The code on the sidewall names the tyre, not the hole. On 3.50-8, 3.50 is the nominal section width in inches and 8 is the rim diameter in inches. UK shops usually sell that as a 14 inch wheel of about 350–360 mm. The TMZ listing states 14 inch and 360 mm for a 3.50-8. About 350 mm is common. A 4.00-6 is a 6 inch rim code. The Crystals title uses 4.00-6 and also says 35 cm, so the code and the diameter on that page are not describing one wheel. A 4.10/3.50-4, the Yarlung pair, is about 10 inches overall, a sack-truck size. The 1PZ two-pack states 3.50-8 and 14.5 inch, which can sit taller than a 350 mm wheel.

Axle bore, reducers, and bearings

The bore is the hole. The axle is the bar that passes through it. Sizes in this set include 12, 13, 16, 20, 21, 25, and 25.4 mm, and 25.4 mm is 1 inch. The TMZ wheel states 25.4 mm. The Crystals wheel states 25 mm, with reducers for 20, 16, and 12 mm. A 13 mm axle is not in that bag. A reducer changes a larger hole to a smaller axle. It is not a bearing unless the listing says so. The Yarlung pair states 5/8 inch ball bearings. The KetoPlastics kit states 13 mm bushes and does not state a separate bore. Replacing the axle itself is a different step, covered in how to replace a wheelbarrow wheel.
KetoPlastics KetoPlastics 14 inch foam-filled wheel with axle, 3.50-8

Testsieger

KetoPlastics KetoPlastics 14 inch foam-filled wheel with axle, 3.50-8
8.3/10about £17.99
View offer

Hub length and the bracket gap

Hub length is how wide the centre is, including bush collars if they stick out. The bracket gap is the space between the legs where that hub has to sit. A hub that is too short slides from side to side. A hub that is too long stands proud, and the nut may never reach a full thread. The TMZ listing states a 75 mm hub. KetoPlastics states 75 mm excluding bushes and 96 mm with them. Neither figure is your bracket gap until you measure it. Keystone Castors tells buyers to check the shaft and the hub. Spacers fill a short hub. They do not shorten a long one.

Measure in this order

Start with the old wheel on the barrow if you still can. Read the code on the sidewall, then the overall diameter across the tyre, not across the rim alone. Measure the axle where it is clean, away from paint and rust. Then measure the hub length through the axle hole, and the gap between the inside faces of the brackets. Write the five numbers down before you open amazon.co.uk. Do not substitute 14 inch for the code, or universal for the bore. A 25.4 mm axle in an 80 mm gap is a different purchase from a 16 mm axle in a 75 mm gap, even when both tyres say 3.50-8.

Read a listing in one minute

The TMZ page gives you a 3.50-8, 360 mm, a 25.4 mm bore, and a 75 mm hub. The KetoPlastics page gives 13 mm bushes. The Crystals page gives a 25 mm bore and three reducers, then disagrees with itself: the title says 4.00-6 PU and a bullet says pneumatic rubber at 30 PSI. A missing bore is a reason to leave the listing. Who should buy which wheel, after the numbers match, is on best wheelbarrow wheel. What to decide before a brand name is in the replacement wheelbarrow wheel guide.

Common questions

What size wheelbarrow wheel do I need?
You need the size that matches the wheel you are removing: the tyre code, the overall diameter, the axle bore, the hub length, and the bracket gap. For many UK garden barrows that is a 3.50-8 of about 350–360 mm, and the bore is still a separate measurement. A listing that only says 14 inch has not answered the question.
What does 3.50-8 mean on a wheelbarrow tyre?
The first number, 3.50, is the nominal section width in inches. The second number, 8, is the rim diameter in inches. Shops often sell the whole wheel as 14 inch, around 350–360 mm across the tyre. The code does not include the axle size. Two 3.50-8 wheels can have a 25.4 mm bore and a 16 mm bore.
How do I measure the axle bore?
Measure the axle that will go through the wheel, on a clean section, in millimetres. That diameter has to match the bore, or a reducer that brings the bore down to it. If you are holding the old wheel, the bore is the hole in the centre, which can be larger than the axle when a bush was fitted. A plastic reducer is not a bearing unless the listing says so.
What is hub length, and why does it matter?
Hub length is the width of the centre along the axle, including collars that stick out. It has to sit in the gap between the brackets. The TMZ listing states 75 mm. KetoPlastics states 75 mm without bushes and 96 mm with them. Too short and the wheel slops sideways. Too long and it will not sit between the legs, or the nut runs out of thread.
Can I fit a 4.00-6 where a 3.50-8 was?
Not as a like-for-like swap. A 4.00-6 names a 6 inch rim. A 3.50-8 names an 8 inch rim and is the usual 14 inch barrow tyre. The Crystals page uses both a 4.00-6 title and a 35 cm diameter, so read it twice. Spacers can fill a short hub. They cannot shorten a long one.

Related pages

Puncture-proof vs pneumatic

Wheelbarrow wheel

Best wheelbarrow wheel: fit the bore, then the tyre

Replacement wheelbarrow wheel: measure before you buy

How to replace a wheelbarrow wheel, then when to stop

Sources

Public UK sources used for this comparison. Listing prices, stars, and review counts are from amazon.co.uk on 15 October 2026.

  1. Consumer Rights Act 2015, section 9 (retrieved 15.10.2026)
  2. General Product Safety Regulations 2005, Great Britain (retrieved 15.10.2026)
  3. Product safety advice for businesses, GOV.UK (retrieved 15.10.2026)
  4. HSE RAPP tool, INDG478 (retrieved 15.10.2026)
  5. HSE push and pull assessment (retrieved 15.10.2026)
  6. Which? How to buy the best wheelbarrow (retrieved 15.10.2026)
  7. QED Castors, puncture-proof wheels (retrieved 15.10.2026)
  8. RocwooD 14 inch pneumatic wheelbarrow wheel (retrieved 15.10.2026)
  9. Titan Pro wheelbarrow wheel installation guide (retrieved 15.10.2026)