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58

スパナ 13mm

Worth a look

Shows low returns (0.5%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 86Growth 14Conversion 97Competition 56Returns 98Price range 0Avg price 0Brand share 40Review moat 74Quality gap 77

Returns

Incredible0.5%

return rate — above 5% kills the launch gate

Conversion

Incredible15.9%

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

Market size

Great¥1.5M

¥1.5M/yr · 14K searches

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Review moat

Good533.48

avg incumbent reviews — the moat a new listing must climb

Competition

Good52%

top-5 click share — leaders hold, buyers still browse

Brand share

Okay81%

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

Growth

Bad-21.8%

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

Avg price

Bad¥651.88

avg listing price — sweet spot $15–$100

Price range

Bad¥349.41–¥1433.76

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

According to Flapen's Amazon Japan niche tracking, スパナ 13mm is a ¥1.5M/yr Amazon Japan market (14K searches/yr). The top 5 brands hold 81% of demand. Verdict: Worth a look — 58/100.

Data updated Jul 30, 2026 · scored weekly · How we score niches

スパナ 13mm market data

Units sold / yr
1K–1K
avg 0–100/product
Revenue / yr
¥652K–¥815K
units × avg price
Conversion rate
15.9%
Avg BSR
#33
Page quality
0%
Prime
100%
Sponsored
63%
Out of stock
0.9%
Avg brand age
68 months
Avg seller age
218 days

Competition & brand share

The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.

Brands

13 falling

Sellers

78

Top-5 brand share

81%

Top 20: 100%

Top-5 click share

52%

Top 20: 92%

Open market

14%

  • トネ(TONE)43%
  • SK11(エスケー11)18%
  • Amazonベーシック(Amazon Basics)7%
  • DFsucces7%
  • trad(トラッド)7%
  • デイトナ(Daytona)5%
  • Open — no brand owns it (7 brands, 14%)

Demand & seasonality

Weekly Amazon search volume, last 69 weeks — -21.8% search growth over the last 90 days.
400300Spike '25Prime Day '25Spike '26AprMayJunJulAugSepOctNovDecJanFebMarAprMayJunJul

No pronounced peak months · busiest ÷ quietest = 1.4×

Top スパナ 13mm search terms

  • 13mm スパナ4K/yr
  • スパナ 13mm6K/yr
  • 13mm レンチ4K/yr
All search terms

Top スパナ 13mm 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.

0%10%¥147K20%¥294K30%¥441K40%¥588K1101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

What buyers say about スパナ 13mm

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

What buyers love

使用の容易さ26%

“シンプル・イズ・ベスト”

総合品質19%

“品質はそこそこ、これで充分です。”

コストパフォーマンス15%

“コスパ良し”

サイズ全体10%

“よく使うサイズと、自転車ペダル用のサイズが揃ってホルダーまで付いてるので大満足です。”

ロック機構3%

“こちらはラチェット機能も付いており、ほかのレンチの受けとしてもラチェットとしても使える。”

質感/一貫性全体3%

“質感、強度ともグッド”

コンパクトさ3%

“コンパクト”

厚み2%

“厚みが絶妙”

強さ2%

“柄が長いのでしっかり力がはいりました。かなり力を入れて回しましたが折れたり曲がったりはなかったです”

握り心地2%

“手に馴染みます”

What buyers complain about

サイズ全体22%

“11×13なんてなかなか使わないサイズですが”

互換性-全体6%
機能全体6%

“バルトの頭に首振り部分をはめて、締込みや外しをするとボルトの頭に引っ掛かってスパナは抜けません。”

接着性/粘着性6%

“シールを剥がすときに粘着剤が残ったのが唯一気になった点ですが”

総合品質6%

“安いが、セット内容がめちゃくちゃで必要なサイズが無かった。”

材料の品質6%

“材質は弱い部分などはありますが、簡単なメンテナンスなどには重宝してます。”

耐久性6%

“家庭用除雪機のピン交換に使用中、耐久性はまだ分からずですが、コスパ的に優れ材質や動きもいい感じです。”

使用の容易さ6%

“使いにくい”

厚み3%

“普段使う事がない薄での工具”

広告と実際の製品の違い3%

“商品ページの画像1枚目が実物に近いです。”

Top return reasons

サイズ全体67%
不良材料/部品10%
総合品質10%
使用の容易さ5%
機能全体5%
持続不可能なデザイン5%

Common questions

Is スパナ 13mm profitable to sell on Amazon Japan?
The niche generates ¥1.5M/yr across 27 tracked products. 90-day search growth is -21.8%. Flapen's verdict: Worth a look (58/100).
How competitive is the スパナ 13mm niche?
13 brands and 78 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 81% of demand.
What do buyers complain about in スパナ 13mm?
Top complaints mined from reviews: サイズ全体, 互換性-全体, 機能全体. The return rate is 0.5%.
When does demand for スパナ 13mm peak?
Demand is steady year-round — the busiest month runs 1.4× the quietest.
What does it cost to enter the スパナ 13mm niche?
Listings span ¥349.41–¥1433.76; the average listing price is ¥651.88 (sweet spot $15–$100). The average incumbent carries 533 reviews — the moat a new listing must climb.