Is 18x8.50-8 tube profitable to sell on Amazon United States?

The niche generates $44K/yr across 14 tracked products. 0 of 5 products launched in the last 360 days are still selling. 90-day search growth is +107.9%. Flapen's verdict: Worth a look (60/100).

How competitive is the 18x8.50-8 tube niche?

13 brands and 15 sellers compete. The top 5 products take 64% of clicks and top 5 brands hold 72% of demand.

What do buyers complain about in 18x8.50-8 tube?

Top complaints mined from reviews: Quality-Overall, Durability, Functionality-Overall. The return rate is 2.3%.

When does demand for 18x8.50-8 tube peak?

Demand peaks in Apr–May–Jun–Jul–Aug; the busiest month runs 4.8× the quietest.

What does it cost to enter the 18x8.50-8 tube niche?

Listings span $14.25–$24.12; the average listing price is $20.68 (sweet spot $15–$100). The average incumbent carries 1,806 reviews — the moat a new listing must climb.

18x8.50-8 tube

Worth a look

Shows searches that convert (16.8% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Conversion

Incredible16.8%

search→purchase rate — share of searches ending in a sale

Growth

Great+107.9%

90-day search growth — must beat 0% to launch

Avg price

Great$20.68

avg listing price — sweet spot $15–$100

Price range

Great$14.25–$24.12

cheapest to priciest tracked listing — scored on the share inside $15–$100

Returns

Good2.3%

return rate — above 5% kills the launch gate

Brand share

Good72%

top-5 brand share — brands hold most of the demand

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Review moat

Okay1,805.57

avg incumbent reviews — the moat a new listing must climb

Competition

Okay64%

top-5 click share — leaders hold, buyers still browse

Market size

Bad$44K

$44K/yr · 13K searches

Signals Trending

According to Flapen's Amazon United States niche tracking, 18x8.50-8 tube is a $44K/yr Amazon United States market (13K searches/yr). The top 5 brands hold 72% of demand. Demand peaks in Apr–May–Jun–Jul–Aug. Verdict: Worth a look — 60/100.

Data updated Jul 9, 2026 · scored weekly · How we score niches

Competition & brand share

The top 5 products take 64% of clicks — established leaders, but buyers still shop beyond them.

Brands

13 rising

Sellers

Top-5 brand share

72%

Top 20: 100%

Top-5 click share

64%

Top 20: 100%

Open market

22%

AR-PRO33%
CALU LUKY15%
FVRITO8%
SPORTYOUTH8%
GICOOL8%
weyleity7%

Demand & seasonality

Weekly Amazon search volume, last 102 weeks — +107.9% search growth over the last 90 days.

Peak months: Apr, May, Jun, Jul, Aug · busiest ÷ quietest = 4.8×

Open Trend

Top 18x8.50-8 tube products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 14 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

18x8.50/9.50-8 Replacement Inner Tube with TR-13 Valve Stem (2-Pack) - For Golf Cart/Tractor/Lawn Mower and More

AR-PRO$24.124.3★20,285 rev

18x8.50-8/18x9.50-8 Inner Tube with TR-13 Valve Stem - 18x8.50/9.50-8 Replacement Inner Tube For Golf Cart Tractor Lawn Mower Hand Trucks Wheelbarrows and More (2-Pack)

CALU LUKY$22.994.6★230 rev

FVRITO 18x8.50-8 18x9.50-8 Inner Tube for ATV Quad 4 Wheeler Go Kart Lawn Tractor Snow Blower Golf Cart Garden Trailer Heavy Duty Lawn Mower Turf With TR-13 Straight Valve Stem 2 Pack

FVRITO$23.324.5★605 rev

18x8.50-8 18x9.50-8 Inner Tubes 2 Pack Heavy Duty Replacement Tire Inner Tubes with Straight Valve Stem for Lawn Mowers Wheelbarrows ATVs Go Karts Tractors Snow Blowers Golf Carts Trailers

SPORTYOUTH$22.194.4★1,260 rev

GICOOL 18x8.50/9.50-8 Inner Tubes 2 Pack with TR13 Valve Stem Heavy-Duty Replacement Tubes for Lawn Mowers Tractors Golf Carts Scooters Go Karts Wagons Trailers ATVs Snow Blowers

GICOOL$22.474.4★1,174 rev

Newest

by launch date

FLKQC 2 Pack 18X8.50/9.50-8 Inner Tubes with TR-13 Valve Stem Replacement Lawn Mower Tire Tubes for Tractors Wheelbarrows ATVs Go Karts & More (Fits 8.5 to 9.5 Wide)

FLKQC$18.3629 rev

7mo ago

NATGAI 2 Pack 18x8.50-8 18x9.50-8 Inner Tubes Replacement Tire Tube with TR-13 Straight Valve Stem Fits Lawn Mowers Yard Tractors Go Karts Golf Carts ATVs Wheelbarrows Hand Trucks

NATGAI$19.2018 rev

8mo ago

18x8.50-8 18x9.50-8 Lawn Mowers Tubes with TR13 Straight Valve Stem Heavy Duty Replacement Inner Tubes for Garden Trailer Tractor Golf Cart

SIMEIQI$20.79486 rev

10mo ago

RONPOW 18x8.50-8 & 18x9.50-8 Inner Tube TR-13 Straight Valve Stem Heavy-Duty 18x8.50-8 & 18x9.50-8 Lawn Mower Tires Tubes Fits Riding Mowers Yard Trailers Garden Tractors ATVs 2 Pack

RONPOW$22.4747 rev

11mo ago

weyleity 2 Pack 18x8.50-8 18x9.50-8 Inner Tube | Heavy Duty Replacement Tire Tubes with TR13 Straight Valve Stem for Go Karts ATVs (18x8.5/9.5-8 TR13)

weyleity$18.94155 rev

12mo ago

What buyers say about 18x8.50-8 tube

What buyers praise and complain about, mined from review topics.

What buyers love

Value For Money24%

“Good value”

Quality-Overall22%

“Good Quality”

Size-Overall18%

“Great fit”

Advertised Vs Actual Product13%

“Works as should”

Weight Heavy7%

“These are definitely heavy duty”

Durability4%

“Durable & Fit Great”

Assembly/Installation3%

“were easy to install”

Thickness3%

“The material feels thick”

Design-Overall2%

“Works as designed”

Tread Pattern Pitch2%

“beats buying new tires when the tread is still good”

What buyers complain about

Quality-Overall51%

“Tubes are pure garbage”

Durability15%

“the valve stem broke off near the base when I was inserting it through the hole in the rim”

Functionality-Overall11%

“DID NOT HOLD AIR”

Size-Overall7%

“Does not fit as stated”

Thickness7%

“They are a bit more challenging because of the thickness when installing”

Strength5%

“brittle or something or very low quality”

Assembly/Installation4%

“Valve stem broke when trying to install”

Top return reasons

Size-Overall70%

Functionality-Overall5%

Value For Money5%

Compatibility-Overall5%

Assembly/Installation4%

Advertised Vs Actual Product2%

Maintenance And Repair1%

Pressure1%

Quality-Overall1%

Strength1%

Common questions

Is 18x8.50-8 tube profitable to sell on Amazon United States?: The niche generates $44K/yr across 14 tracked products. 0 of 5 products launched in the last 360 days are still selling. 90-day search growth is +107.9%. Flapen's verdict: Worth a look (60/100).
How competitive is the 18x8.50-8 tube niche?: 13 brands and 15 sellers compete. The top 5 products take 64% of clicks and top 5 brands hold 72% of demand.
What do buyers complain about in 18x8.50-8 tube?: Top complaints mined from reviews: Quality-Overall, Durability, Functionality-Overall. The return rate is 2.3%.
When does demand for 18x8.50-8 tube peak?: Demand peaks in Apr–May–Jun–Jul–Aug; the busiest month runs 4.8× the quietest.
What does it cost to enter the 18x8.50-8 tube niche?: Listings span $14.25–$24.12; the average listing price is $20.68 (sweet spot $15–$100). The average incumbent carries 1,806 reviews — the moat a new listing must climb.