Model-family comparison

RYOBI 20-inch 40V HP push, self-propelled or CrossCut?

The 20-inch RYOBI 40V HP walk-behinds make a useful comparison because the model numbers separate three real choices: push versus rear-wheel self-propel, a conventional single blade versus CrossCut, and a bare tool versus a battery-and-charger kit. Start with the way you want the mower to travel. Then check the blade and package you are actually buying; a shared voltage label does not mean every configuration operates the same way.

Choose the travel arrangement first

The RY40HPLM06B and RY40HPLM06K are push-only. The B is tool-only; the K includes a 6 Ah pack and fast charger. Their shared mower has a 20-inch deck and one conventional blade. These are the direct options if you are comfortable providing the push effort and want a compact walk-behind. Do not expect self-propulsion from a battery package suffix: that changes what is in the box, not the drive.

The RY40HPLM07B and RY40HPLM07K add rear-wheel self-propelled travel but retain a single blade and the same nominal 20-inch width. Their B/K distinction again concerns package contents: the bare tool has no battery or charger, while the K kit lists one 6 Ah battery and a fast charger. The operator remains in control of steering and mowing direction. The manual shows a speed selector and self-propel paddle, so do not confuse the 07’s arrangement with the separately named Smart Trek control on other RYOBI mowers.

When CrossCut is the deciding feature

The RY40HPLM08K is the distinct CrossCut choice in this 20-inch group. It combines rear-wheel drive with RYOBI’s multi-blade system and arrives with one 8 Ah battery and a rapid charger. It has one active battery port; the storage compartment for an extra pack is not a second powered port. CrossCut is a hardware distinction, not another name for mulching or bagging. The product page describes all three clipping routes—mulching, bagging and side discharge—but the manual’s attachments and setup instructions still govern each use.

CrossCut does not by itself prove a better result on every lawn. RYOBI’s comparative descriptions are manufacturer claims, not independent cut tests. If your ordinary requirement is collecting clippings, a single-blade mower with a bagging setup may still suit the job. Choose the 08K when the exact multi-blade design is important to you, not because a mode name suggests a result that the available evidence does not establish.

Read the battery package as part of the mower

RYOBI advertises up to 50 minutes and up to a half-acre for the 06 using one 6 Ah pack, up to 45 minutes and a half-acre for the 07 with one 6 Ah pack, and up to 55 minutes and a half-acre for the 08 with one 8 Ah pack. These are the maker’s maximum estimates, not measured mowing times or guaranteed coverage for a particular lawn. Grass height and moisture, clipping route, pace, turns and battery condition all change the work completed. In particular, the B packages do not include the battery used for the advertised runtime; check the exact listing and budget for a compatible pack and charger if you need them.

The 06K and 07K kits both include one 6 Ah battery, but the mower beneath the battery package is different: the former is push-only and the latter self-propelled. The 08K’s 8 Ah pack also does not mean the mower has two active slots. If the most important need is an included battery, compare package contents; if it is powered travel or CrossCut, use those separate equipment requirements. A larger capacity claim is not a shortcut to predicting the lawn area you will finish.

Keep width, slopes and storage in perspective

A 20-inch cutting width may be attractive on a lawn with narrow turns, but it is not the full outside width of the assembled mower. Measure the narrowest gate, storage opening and turning area. The earlier 21-inch 01K2, 02K2, 03K2, 04K2 and 05K models provide a nearby 21-inch comparison, but they are not substitutes for checking exact drive, blade and battery details.

Follow the manual for the specific model. The inspected 06 and 07 manuals warn against excessively steep slopes without giving the same numerical maximum found in the 08 manual. For the 08, RYOBI says not to mow on inclines greater than 15 degrees and to mow across the slope rather than up or down; that is a stated maximum warning, not a promise that any slope below it is safe. The manuals also caution against wet grass and require key and battery removal and a stopped blade before maintenance. Folding handles can help with storage, but check the packed mower’s actual clearance and use the maker’s storage procedure.

Match the model to the routine

• Pick the 06B if you want the push mower and already have compatible 40V power; choose the 06K if you need its specified 6 Ah battery and charger.
• Pick the 07B for self-propelled rear-wheel drive when you already own the battery setup; pick the 07K for the same travel and blade arrangement with a 6 Ah kit.
• Pick the 08K when you want the CrossCut system, self-propelled rear wheels and the included 8 Ah kit, while observing its exact manual precautions.

None is a universal winner. The right comparison is the machine and package that fit your route, effort, charging plan and storage—not the highest runtime headline. These model assessments cover the five stated 20-inch configurations; RYOBI’s wider mower catalog includes other model families and remains a separate set of choices.

Sources: the exact RY40HPLM06B, RY40HPLM06K, RY40HPLM07B, RY40HPLM07K and RY40HPLM08K product pages, plus the model-number RYOBI support portal and the corresponding RY40HPLM06, 07 and 08 operator-manual text. This is source-based analysis, not hands-on testing.