spark plugs
Worth a lookShows a $12.6M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size
Incredible$12.6M$12.6M/yr · 10.3M searches
Avg price
Great$46.82avg listing price — sweet spot $15–$100
Competition
Great27%top-5 click share — an open shelf
Review moat
Good1,236.24avg incumbent reviews — the moat a new listing must climb
Brand share
Good71%top-5 brand share — brands hold most of the demand
Price range
Good$3.28–$164.27cheapest to priciest tracked listing — scored on the share inside $15–$100
Returns
Okay3.9%return rate — above 6% kills the launch gate
Conversion
Okay2.6%search→purchase rate — share of searches ending in a sale
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Growth
Bad-12.5%90-day search growth — must beat 0% to launch
Competition
Clicks spread well past the top 5 (27% combined) — an open shelf where new products get seen.Brands
32 rising
Sellers
172
Top-5 brand share
71%
Open market
25%
- NGK49%
- Bosch8%
- A-Premium6%
- ACDelco5%
- ENA4%
- LCWRGS4%
Product shelf
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 106 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
NGK LKR7DIX-11S Iridium IX Spark Plug (93175 Iridium Ix) 4 Pack
NGK$33.544.6★2,242 rev
NGK # 3186 G-Power Platinum Spark Plugs TR5GP - 8 PCSNEW
NGK$35.164.6★4,890 rev
NGK LKAR7BIX-11S Iridium IX Spark Plug (93501 Iridium Ix) 4 Pack
NGK$34.084.5★2,854 rev
NGK 3951 Spark Plugs TR55 (6 Pack)
NGK$20.714.7★5,018 rev
NGK 3951 Spark Plugs TR55 (8 Pack)
NGK$26.854.6★5,004 rev
Newest
by launch date
Teybouk 4PCS Car Spark Plugs Iridium Car Ignition Plugs Designed for 5464 BKR5EIX-11 Vehicle Ignition System Upgrade Replacement Parts Compatible with Honda Lexus (Silver)
Teybouk$11.4823 rev
Iridium Spark Plugs 4 Pack 7092 BKR6EGP Fit for Toyota Camry RAV4 Celica Solara Matrix Corolla Highlander Dodge Neon Pontiac Vibe Scion tC xB Honda CRZ Subaru Forester Impreza Acura Integra
A-NAFTULY$17.6682 rev
Ignition Coil Pack and Iridium Spark Plugs Set of 6 Compatible with Chrysler 200 300 Town & Jeep Grand Cherokee/Wrangler & Dodge Grand Caravan/Charger/Journey & Ram 1500/ProMaster 3.6L V6 UF648+97390
Motorevo$69.5563 rev
WJAUTO Spark Plugs Iridium 4 Pack Pre-Gapped Bujas Sparkplugs OEM Replacement for Hyundai Sonata Kia Acura Chrysler Honda Lexus Mazda Mercedes-B-ENZ Mini Mitsubishi
WJAUTO$19.3377 rev
WJAUTO Spark Plugs Iridium 4 Pack Pre-Gapped Bujas Sparkplugs OEM Replacement for Toyota Mazda Nissan Mercedes-Benz Lexus Land Rover Jaguar Infiniti Chevrolet Acura Pontiac Scion Suzuki
WJAUTO$19.2647 rev
Trending
90-day click momentum
APR Iridium Pro Spark Plug Z1003100 - For Select VW Group MQB & MLB Engine Models (Volkswagen Audi & Porsche) - 14x26.5x16mm - Heat Range 9 - Performance Upgrade - Replaces OEM Stock Parts - 1 Pack
APR$29.564.8★
NGK 2667 Spark Plug BKR7EIX Iridium IX (4 Pack)
NGK$35.704.7★
Teybouk 4PCS Car Spark Plugs Iridium Car Ignition Plugs Designed for 5464 BKR5EIX-11 Vehicle Ignition System Upgrade Replacement Parts Compatible with Honda Lexus (Silver)
Teybouk$11.484.4★
NGK Spark Plugs (USA) Inc. IZFR6K11 Spark Plugs Izfr6K11 4Pack
NGK$46.544.8★
Iridium Spark Plugs 4 Pack 7092 BKR6EGP Fit for Toyota Camry RAV4 Celica Solara Matrix Corolla Highlander Dodge Neon Pontiac Vibe Scion tC xB Honda CRZ Subaru Forester Impreza Acura Integra
A-NAFTULY$17.664.7★
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -12.5% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.5×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Good quality tool”
“Fair price”
“Fits application”
“Good sockets”
“As advertised”
“Easy Installation”
“Work flawlessly”
“didn't break anything”
“Ease of removal”
“More fuel efficient”
What buyers complain about
“Horrible quality”
“Broke during first use”
“They are too large”
“Not compatible”
“Not a good purchase even with the low price”
“the magnet fell out”
“Worst plugs”
“One was use before or somebody tried to use”
“Faulty parts”
“Many misfires”