Skip to content
46

ngk bkr5e

Skip it

Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.

Market size 11Growth 70Conversion 96Competition 21Returns 89Price range 61Avg price 49Brand share 0Review moat 90Quality gap 21

Conversion

Incredible13.6%

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

Review moat

Great208.57

avg incumbent reviews — the moat a new listing must climb

Returns

Great1.3%

return rate — above 6% kills the launch gate

Growth

Good+52.7%

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

Price range

Good$7.41–$26.66

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

Avg price

Okay$11.84

avg listing price — sweet spot $15–$100

Competition

Bad75%

top-5 click share — a locked-up shelf

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Market size

Bad$43K

$43K/yr · 27K searches

Brand share

Bad100%

top-5 brand share — brand-locked demand

Competition

The top 5 products capture 75% of clicks — a locked-up shelf that new listings rarely crack.

Brands

4 rising

Sellers

53

Top-5 brand share

100%

Open market

0%

  • NGK79%
  • LEFITPA13%
  • JSIERLUOV5%
  • Eopzol3%

Product shelf

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

0%10%$4K20%$9K30%$13K40%$17K101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

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

Demand & seasonality

Weekly Amazon search volume, last 58 weeks — +52.7% search growth over the last 90 days.
1K600Spike '26JunJulAugSepOctNovDecJanFebMarAprMayJun

Peak months: Mar, Apr, May · busiest ÷ quietest = 3.3×

Reviews

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

What buyers love

Socket/Port/Plug22%

“Good plugs at a good price”

Quality-Overall15%

“Good quality”

Value For Money15%

“Good product for a fair price”

Advertised Vs Actual Product13%

“Exactly what I needed”

Size-Overall13%

“Correct size”

Efficiency7%

“Vehicle runs better”

Assembly/Installation4%

“Easy to install”

Functionality-Overall2%

“Well, these are spark plus and after installing my mower actually ran”

Product Condition2%

“when I take these out they still look like they're new”

Brightness/Shine/Glow2%

“Sparky”

What buyers complain about

Compatibility-Overall33%

“Does not fit for John Deere 318”

Quality-Overall25%

“Cheap”

Defective Material/Parts17%

“Parts do not fit”

Size-Overall17%

“it seems loose”

Top return reasons

Size-Overall48%
Advertised Vs Actual Product17%
Compatibility-Overall9%
Value For Money7%
Defective Material/Parts5%
Functionality-Overall4%
Socket/Port/Plug3%
Motor Issues2%
Assembly/Installation1%
Heating1%