shim kit
Skip itSoft demand (-8.0% this quarter) — this niche doesn't clear our bar today.
Review moat
Great144.32avg incumbent reviews — the moat a new listing must climb
Avg price
Great$54.09avg listing price — sweet spot $15–$100
Returns
Good2.5%return rate — above 5% kills the launch gate
Conversion
Good4.5%search→purchase rate — share of searches ending in a sale
Competition
Good54%top-5 click share — leaders hold, buyers still browse
Price range
Okay$10.03–$228.97cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Okay83%top-5 brand share — brands hold most of the demand
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Market size
Okay$103K$103K/yr · 42K searches
Growth
Bad-8.0%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, shim kit is a $103K/yr Amazon United States market (42K searches/yr). The top 5 brands hold 83% of demand. Verdict: Skip it — 44/100.
Data updated Jul 9, 2026 · scored weekly · How we score niches
shim kit market data
- Units sold / yr
- 2K–2K
- avg 0–100/product
- Revenue / yr
- $81K–$108K
- units × avg price
- Conversion rate
- 4.5%
- Avg BSR
- #127
- Page quality
- 0%
- Prime
- 96%
- Sponsored
- 93%
- Out of stock
- 0.6%
- Avg brand age
- 58 months
- Avg seller age
- 187 days
Competition & brand share
The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them.Brands
14 flat
Sellers
38
Top-5 brand share
83%
Top 20: 100%
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 & seasonality
Weekly Amazon search volume, last 62 weeks — -8.0% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.4×
Top shim kit search terms
- 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
Top shim kit 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Hot Cams 7.48mm Complete Shim Kit HCSHIM01 for Honda CRF Kawasaki KX Suzuki RMZ Yamaha WR YZ Dirt Bikes
Hot Cams$86.104.7★917 rev
Hot Cams 9.48mm Complete Shim Kit HCSHIM02 for Arctic Cat DVX 400 ATV Honda TRX ATV Kawasaki KFX ATV Suzuki LT-R ATV Yamaha YFZ ATV Regular
Hot Cams$81.894.6★918 rev
TACSHIM Black 1/2x28 Barrel Shim Kit for .223 5.56 (14 Pack)
TACSHIM$14.014.7★185 rev
47Pcs 7.48mm Valve Shim Kit for Honda CRF 250R/X Kawasaki KX 250F Suzuki RMZ 250 Yamaha YZ 250F WR 250F Dirt Bikes
MUYIDP$27.954.6★92 rev
TACSHIM Black 5/8x24 Barrel Shim Kit for .308 7.62mm 300BLK .30 Cal (14 Pack)
TACSHIM$14.044.7★134 rev
Newest
by launch date
100PCS 304 Stainless Steel Shim Kit 2 x 2 Slotted Assortment Box
Shark Tears$87.7831 rev
304 Stainless Steel Shim Kit 100 PCS 2 x 2 Slotted Shims Assortment 10 Thicknesses for Machine Leveling Motor Alignment & Equipment Adjustment Laser-Marked Sizes with Storage Case
GtohHavea$86.6255 rev
Shimeyao 80 Pcs Size A 2 x 2 Stainless Steel Slotted Shims Kit Composite Precision Metal Shims Stock for Leveling Assortment with Storage Box 8 or 13 Thicknesses for Machinist Motor Shop Wood Door
Shimeyao$89.0523 rev
TACSHIM Barrel Nut Shim Kit for .308 (16 Pack) MFR#10BN
TACSHIM$13.0540 rev
AWSZH Adjustable Valve Shim Kit 7.48mm Compatible with Honda CRF250X 2004-2017 Kawasaki KLX250 1979-1980 Suzuki TL1000S 1997-2001 Yamaha FZS600 FZ6 2004-2007 Yamaha YZF-R6 1999-2009 Dirt Bikes(47Pcs)
AWSZH$33.223 rev
Trending
90-day click momentum304 Stainless Steel Shim Kit 100 PCS 2 x 2 Slotted Shims Assortment 10 Thicknesses for Machine Leveling Motor Alignment & Equipment Adjustment Laser-Marked Sizes with Storage Case
GtohHavea$86.624.5★
AWSZH Adjustable Valve Shim Kit 7.48mm Compatible with Honda CRF250X 2004-2017 Kawasaki KLX250 1979-1980 Suzuki TL1000S 1997-2001 Yamaha FZS600 FZ6 2004-2007 Yamaha YZF-R6 1999-2009 Dirt Bikes(47Pcs)
AWSZH$33.224.3★
100PCS 304 Stainless Steel Shim Kit 2 x 2 Slotted Assortment Box
Shark Tears$87.784.4★
OTOM D9.48mm Thick 1.20-3.50mm Adjustable Valve Shim Kit for CRF450R CRF450X/RX YZ450F WR450F(141PCS)
PROOTOM$66.784.7★
PlasmaGal - 1/2 x 28 Muzzle Shim Kit for .223 & 5.56 Calibers (20 Pieces) Stainless Steel Barrel Washers for Perfect Alignment (4 Units x 5 Thickness - 0.004/0.008/0.012/0.020/0.040)
PLASMAGAL$11.864.6★
What buyers say about shim kit
What buyers praise and complain about, mined from review topics.What buyers love
“Well manufactured kit”
“Fits perfectly”
“Works as advertised”
“Good Value”
“There are other uses for these”
“which is convenient”
“Perfect for timing AR muzzle devices”
“Thickness accurate”
“Shims work just as they should”
“Works perfect for AR”
What buyers complain about
“Thickness variations are noticeable”
“Do not believe the description”
“Does not fit all barrels”
“I was extremely disappointed with the quality control”
“There is no way to adjust the shims because there is no way to make a”
“They are, however, a bit finnicky to use”
“WON'T WORK ON ITEMAS”
“It bent easily during installation”
Top return reasons
Common questions
- Is shim kit profitable to sell on Amazon United States?
- The niche generates $103K/yr across 28 tracked products. 3 of 4 products launched in the last 360 days are still selling. 90-day search growth is -8.0%. Flapen's verdict: Skip it (44/100).
- How competitive is the shim kit niche?
- 14 brands and 38 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 83% of demand.
- What do buyers complain about in shim kit?
- Top complaints mined from reviews: Thickness, Advertised Vs Actual Product, Size-Overall. The return rate is 2.5%.
- When does demand for shim kit peak?
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- What does it cost to enter the shim kit niche?
- Listings span $10.03–$228.97; the average listing price is $54.09 (sweet spot $15–$100). The average incumbent carries 144 reviews — the moat a new listing must climb.