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51

rear brake rotor

Worth a look

Shows a fragmented shelf (top 5 take 17% of clicks), but prices mostly outside the sweet spot ($4.87–$548.46) keeps it on the watch list.

Market size 51Growth 36Conversion 22Competition 96Returns 30Price range 16Avg price 79Brand share 59Review moat 52Quality gap 47

Competition

Incredible17%

top-5 click share — an open shelf

Avg price

Great$88.16

avg listing price — sweet spot $15–$100

Brand share

Good70%

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

Review moat

Good1,436.54

avg incumbent reviews — the moat a new listing must climb

Market size

Good$299K

$299K/yr · 190K searches

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Growth

Okay+8.8%

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

Returns

Okay5.4%

return rate — above 6% kills the launch gate

Conversion

Bad1.8%

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

Price range

Bad$4.87–$548.46

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

Competition

Clicks spread well past the top 5 (17% combined) — an open shelf where new products get seen.

Brands

25 falling

Sellers

125

Top-5 brand share

70%

Open market

25%

  • TRQ19%
  • Bendix19%
  • ACDelco17%
  • PowerStop9%
  • Bosch6%
  • A-Premium5%

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%2%$6K4%$12K6%$18K8%$24K1101001K10K100K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted

All 128 tracked products in this niche — three views at once, no toggling.

Demand

Weekly Amazon search volume, last 40 weeks — +8.8% search growth over the last 90 days.
5K4KOct '25Nov '25Dec '25Feb '26Mar '26May '26Jun '26

Reviews

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

What buyers love

Size-Overall23%

“Fit like it should and looks great”

Quality-Overall23%

“excellent hardware”

Value For Money15%

“Good price”

Assembly/Installation10%

“Install was straight forward”

Advertised Vs Actual Product4%

“Works as expected”

Friction2%

“Good brake discs with pads”

Functionality-Overall2%

“works”

Strength2%

“Very sturdy”

Efficiency2%

“Work good and look like performance brakes”

Durability2%

“No break dust”

What buyers complain about

Size-Overall14%

“it was actually too big”

Quality-Overall12%

“Very suspect quality control”

Rusts/Corrodes8%

“Prone to rust”

Noise Level8%

“Absolutely deafening squeal”

Compatibility-Overall6%

“Not for 2009 Honda Accord”

Durability5%

“blew up”

Thickness5%

“Thickness of disc”

Advertised Vs Actual Product4%

“False advertising”

Value For Money4%

“honestly buy cheap buy twice”

Functionality-Overall3%

“Doesn't stop as quickly”

Top return reasons

Size-Overall53%
Compatibility-Overall14%
Defective Material/Parts6%
Advertised Vs Actual Product5%
Value For Money4%
Functionality-Overall3%
Thickness2%
Assembly/Installation2%
Product Condition2%
Mounting2%