STIHL FS 70 R
#10 in GasFull review
A pro grade trimmer for owners of big properties who run it for hours at a time and want it to last years.
STIHL $359.99$359.99
The STIHL FS 70 R is the better string trimmer overall, rated 3.4 to 3.2. The STIHL FS 70 R leads on weight. The STIHL FS 70 R costs $20 less ($359.99 vs $379.99).
STIHL FS 91 R
#15 in GasFull review
For acreage, ditches and thick weeds where a 27 cc trimmer bogs down. Too heavy and costly for an ordinary yard.
STIHL $379.99$379.99
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the STIHL FS 70 R for weight (10.3 lb (dry) vs 12 lb (dry)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every gas string trimmer; a clear win is highlighted. How we rank explains each one.
| Factor weight | STIHL FS 70 R | STIHL FS 91 R |
|---|---|---|
| Overall rating | 3.4/5 | 3.2/5 |
| Value 30% | 24 $21.82 per inch of swath ($359.99, 16.5 in swath) | 19 $23.03 per inch of swath ($379.99, 16.5 in swath) |
| Line 20% | 100 .105 in line | 100 .105 in line |
| Swath 15% | 62 16.5 in swath | 62 16.5 in swath |
| Weight 15% | 78 10.3 lb (dry) | 50 12 lb (dry) |
| Warranty 20% | 25 2-year warranty | 25 2-year warranty |
Specifications
| STIHL FS 70 R | STIHL FS 91 R | |
|---|---|---|
| Cutting | ||
| Cutting swath | 16.5 in | 16.5 in |
| Largest line | .105 in | .105 in |
| Line feed | Bump feed | Bump feed |
| Shaft | Straight | Straight |
| Converts to edger | No | No |
| Takes attachments | No | No |
| Power | ||
| Engine or battery | 27.2 cc, 2-stroke | 28.4 cc, 4-stroke |
| Build | ||
| Weight | 10.3 lb (dry) | 12 lb (dry) |
| Warranty | 2 years | 2 years |