Are these numbers invented?

No. Engine HP, weight, and rear lift come from catalog Facts; PTO/hitch only from verified overlays. Missing Facts show as — — we never invent shaft ratings.

How do I check attachments?

Open the Fit checker with Kubota B2301 or Kubota BX2680, pick an attachment type and model, and read Pass/Fail/Partial on hitch, PTO, and lift.

Kubota B2301 vs Kubota BX2680

Both sit in the Sub-Compact class with similar engine horsepower (20.9 vs 24.8 HP). Below: catalog Facts for engine horsepower, weight, and rear lift; PTO and hitch only when verified. The decision points call out who leads on each Fact — engine HP is not a substitute for PTO HP.

Engine horsepower is not PTO horsepower. Missing Facts show as — — we never invent shaft ratings.

Kubota B2301 Profile →Kubota BX2680 Profile →Fit checker →

How to choose

Kubota BX2680 lists higher engine horsepower (24.8 vs 20.9 HP). That is not a PTO advantage — confirm shaft power separately before buying cutters or tillers.
Kubota B2301 has more rear lift (1,411 vs 680 lb @ 24″) — more headroom for heavier three-point tools. Kubota BX2680 needs lighter implements or stricter ballast discipline.
Hitch differs: Kubota B2301 (Category I) vs Kubota BX2680 (Limited Category I). Implement sheets must name the matching class — adapters do not add lift.
Kubota BX2680 has the higher verified PTO rating (19.5 vs 17.4 PTO HP) — that is the Fact for cutters, tillers, and snow blowers, not engine HP.
Next step: open the Fit checker with the tractor that wins on your heaviest implement, and screen hitch, PTO, and lift against that attachment.

When to pick each

Choose Kubota B2301 when you need more rear lift (1,411 vs 680 lb @ 24″) for heavier three-point tools, or implement sheets that explicitly list Category I.

Choose Kubota BX2680 when you need higher verified PTO (19.5 vs 17.4 PTO HP) for cutters, tillers, or snow blowers, or implement sheets that explicitly list Limited Category I.

Spec comparison

Spec	Kubota B2301	Kubota BX2680
Size class	Sub-Compact	Sub-Compact
Engine horsepower	20.9 HP	24.8 HP
Operating weight	1,566 lbs	1,521 lbs
Rear hitch lift @ 24″	1,411 lbs @ 24″	680 lbs @ 24″
Hitch category	Category I	Limited Category I
PTO horsepower	17.4 PTO HP	19.5 PTO HP
PTO RPM	540 RPM	540 RPM

Sources

FAQ

Which is better — Kubota B2301 or Kubota BX2680?: Kubota BX2680 lists higher engine horsepower (24.8 vs 20.9 HP). That is not a PTO advantage — confirm shaft power separately before buying cutters or tillers. Kubota B2301 has more rear lift (1,411 vs 680 lb @ 24″) — more headroom for heavier three-point tools. Kubota BX2680 needs lighter implements or stricter ballast discipline. Choose Kubota B2301 when you need more rear lift (1,411 vs 680 lb @ 24″) for heavier three-point tools, or implement sheets that explicitly list Category I. Choose Kubota BX2680 when you need higher verified PTO (19.5 vs 17.4 PTO HP) for cutters, tillers, or snow blowers, or implement sheets that explicitly list Limited Category I. Use the Fit checker for your heaviest attachment instead of comparing engine HP alone.
Are these numbers invented?: No. Engine HP, weight, and rear lift come from catalog Facts; PTO/hitch only from verified overlays. Missing Facts show as — — we never invent shaft ratings.
How do I check attachments?: Open the Fit checker with Kubota B2301 or Kubota BX2680, pick an attachment type and model, and read Pass/Fail/Partial on hitch, PTO, and lift.