Ryobi
Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw
$119Cheaper
Best Circular Saws · head-to-head
Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw vs Ridgid R8654B 18V OCTANE Brushless Cordless 7-1/4 in. Circular Saw
A sourced, side-by-side comparison. Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw is cheaper at $119. Every spec and price links to its source.
Ridgid
Ridgid R8654B 18V OCTANE Brushless Cordless 7-1/4 in. Circular Saw
$169
Released 2019
Which is better: the Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw or Ridgid R8654B 18V OCTANE Brushless Cordless 7-1/4 in. Circular Saw?
On the specs we track, they're closely matched. The Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw is the cheaper at $119.
See Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw on Amazon See Ridgid R8654B 18V OCTANE Brushless Cordless 7-1/4 in. Circular Saw on Amazon
As an Amazon Associate we earn from qualifying purchases. Prices verified at capture; live price may differ.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw | Ridgid R8654B 18V OCTANE Brushless Cordless 7-1/4 in. Circular Saw |
|---|---|---|
| US price | $119 | $169 |
| Brand | Ryobi | Ridgid |
| Released | — | 2019 |
| Power source | cordless | cordless |
| Blade size (in) | 7-1/4 in | 7-1/4 in |
| Voltage or amps | 18 V | 18 V |
| Max (rpm) | 3800 | 5600 |
| Bevel capacity (°) | 56 deg | 56 deg |
| Brushless | Yes | Yes |
| Weight (lb) | 6.6 lb | 9.5 lb |
| Release | — | 2019 |
Sources — Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw: homedepot.com (verified 2026-06-20). Ridgid R8654B 18V OCTANE Brushless Cordless 7-1/4 in. Circular Saw: homedepot.com (verified 2026-06-20).
What's the difference between the Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw and Ridgid R8654B 18V OCTANE Brushless Cordless 7-1/4 in. Circular Saw?
Where the two actually differ on the specs we track (2 of 7). Matching specs are omitted.
- Max (rpm): Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw 3800 vs Ridgid R8654B 18V OCTANE Brushless Cordless 7-1/4 in. Circular Saw 5600
- Weight (lb): Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw 6.6 lb vs Ridgid R8654B 18V OCTANE Brushless Cordless 7-1/4 in. Circular Saw 9.5 lb
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Ryobi P508 ONE+ 18V Brushless 7-1/4 in. Cordless Circular Saw
Only one whitelisted source covers the exact P508: a 2017 pre-launch preview from Pro Tool Reviews, not a hands-on lab test, so no measured results exist. It praises the brushless motor and 26% larger 7-1/4-inch cut capacity as clear upgrades, but flags the doubled price and still-missing rafter hook. (1 sourced review.)
Praised: Brushless motor upgrade for longer runtime, more power, and longer motor life; 26% larger cut capacity from the full-size 7-1/4-inch blade (up from 6-1/2-inch); LED cut-line light, dust blower, and left-mount blade improve cut-line visibility.
Flagged: Price roughly doubles that of the previous P507 model; Still lacks a rafter hook; Left-mount blade is less convenient for left-handed users.
Ridgid R8654B 18V OCTANE Brushless Cordless 7-1/4 in. Circular Saw
Only one whitelisted tester, Pro Tool Reviews, published a hands-on head-to-head review of the exact R8654B; no other whitelisted hands-on reviews were found. Their verdict: a solid brushless upgrade over Ridgid's Gen5X with excellent blade sightlines and shoe glide, but middling raw power (lowest of three power tiers in their test), a guard that hangs on thin cuts, and heavy weight. (1 sourced review, 1 lab-tested.)
Praised: Excellent, unobstructed blade sightline aided by LED; Magnesium shoe coating glides smoothly over material; Comfortable, well-offset handle with Hex Grip overmold; included vac/dust port.
Flagged: Lower guard hangs on thin shave, miter and compound cuts; Shoe notches off ~1/8 in at 0° and 45°, plus slight crosscut tracking wander; One of the heaviest cordless sidewinders (9.5 lb bare, 12.0 lb with 9.0Ah pack).