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Shim Kit

Fail

Demand is soft, at -8.0% this quarter, so Shim Kit is a Fail.

Flapen Score
44
44 / 100
Ranks 5,081 of 7,287 Automotive niches · −5 vs the category median of 49
Market size
$103K/yr42K searches / yr
90-day growth
-8.0%search demand this quarter
Competition
54%top-5 click share · 14 brands · 38 sellers

Flapen Score

Shim Kit against its category

The dotted line is the Automotive average. Past it, Shim Kit is stronger. Inside it, weaker.

44Fail
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

Market

The Shim Kit market on Amazon at a glance

Shoppers on Amazon United States searched for Shim Kit 42K times last year and spent an estimated $103K. The top 5 brands take 83% of clicks. Flapen scores it 44 out of 100, a Fail.

01 · Demand

An estimated 4.5% of those searches ended in a purchase.

Shoppers searched for this 42K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 4.5% of those searches ended in a purchase. Searches in the last 90 days moved -8.0% against the 90 days before. Searches, conversion and average price together put the market at an estimated $103K a year.

Searches, last 12 months
42K
Growth, 90 days vs prior 90
-8.0%
Conversion, latest week
4.5%
Market size, estimated
$103Ka year
Peak month
April1.4× the quietest month
Top search term
valve shim kit12K searches a year

02 · Price

A sale here is worth $54.09.

Listings sell for $54.09 on average, from $10.03 to $228.97. Amazon reports units sold in ranges. This niche sold 2K to 2K a year. The average listing sells 0 to 100 of them. At $54.09 that is $0 to $5K a year per listing.

Average price
$54.09inside the $15 to $100 sweet spot
Price range
$10.03–$228.97
Amazon United States median price
$24.38across 115,062 niches
Units sold a year
2K–2K
Units per listing a year
0–100
Revenue per listing a year
$0–$5K
Returns
2.5%of orders · Amazon United States median 2.1%

03 · Entry bar

The bar here is ads.

93% of listings pay for placement with sponsored ads. 96% ship with Prime. On an average day, 0.6% of listings are out of stock. The average listing ranks #127 within Engines & Engine Parts. It carries 144 reviews at 4.59 stars, so a new listing needs social proof before a better product.

Sponsored listings
93%
Prime listings
96%
Out of stock, average day
0.6%
Average rank
#127in Engines & Engine Parts
Average rating
4.59 starsAmazon United States average 4.42 stars
Average reviews
144per listing
Listings tracked
28

04 · Newcomers

3 of last year's 4 launches cleared the first-year sales bar.

4 products launched here in the last 12 months. 3 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 58 months on average, so the names here are settling in.

Launched, last 12 months
4
Successful launches
3Amazon's first-year sales bar
Average brand age
58 months

Products

Top Shim Kit products & what they sell for

The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.

Prices and ratings read from Amazon on Jul 9, 2026. The live listing can differ.

Competition

Competition: brands, sellers & click share

The top 5 products take an estimated 54% of clicks. Leaders hold, but buyers still shop past them.

$0$5K$10K$15K$21K1101001K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

14 flat

Sellers

38

Est. top-5 brand share

83%

Top 20: 100%

Est. top-5 click share

54%

Top 20: 92%

Open market

13%

  • Hot Cams40%
  • TACSHIM29%
  • MUYIDP6%
  • PROOTOM5%
  • Easily4%
  • GtohHavea3%
  • Open — no brand owns it (8 brands, 13%)

Demand

Shim Kit search demand

Weekly searches over the year, seasonality beneath. Pick a range.

800600Spike '25Spike '26MayJunJulAugSepOctNovDecJanFebMarAprMayJun

No pronounced peak months · busiest ÷ quietest = 1.4×

Search terms

Top Shim Kit search terms shoppers use

The exact words shoppers type, with estimated yearly volume, growth, and conversion.

  • valve shim kit12K/yr
  • shim kit11K/yr
  • ar shim kit6K/yr
  • valve shims5K/yr
  • slotted shims3K/yr
  • hot cams shim kit4K/yr
  • barrel shims3K/yr

Reviews and returns

What reviews say buyers love and hate about Shim Kit

We read the reviews and the return reasons for every product selling here.

21%of positive reviews mention “Quality-Overall”
21%of negative reviews mention “Thickness”
2.5%of orders come back
“Thickness variations are noticeable”
A buyer, on “Thickness”21% of negative reviews mention the same topic

Every topic

Every topic buyers talk about, one row each.

Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.

14 topics

NegativePositive

FAQ

Common Shim Kit questions

Answered from the same tracked data.

Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data