Keiser
Keiser M3i Indoor Bike
$2985
Released 2019
Best Exercise Bikes · head-to-head
Keiser M3i Indoor Bike vs Sole SB900 Indoor Cycle
A sourced, side-by-side comparison. Sole SB900 Indoor Cycle is cheaper at $1199.99. Every spec and price links to its source.
Sole
Sole SB900 Indoor Cycle
$1199.99Cheaper
Which is better: the Keiser M3i Indoor Bike or Sole SB900 Indoor Cycle?
They split the 2 specs we compare evenly. The Sole SB900 Indoor Cycle is the cheaper at $1199.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Keiser M3i Indoor Bike | Sole SB900 Indoor Cycle |
|---|---|---|
| US price | $2985 | $1199.99 |
| Brand | Keiser | Sole |
| Released | 2019 | — |
| Bike type | indoor | indoor |
| Resistance type | eddy current magnetic (non-contact) | magnetic (eddy current) |
| Resistance levels | 24 | 100 |
| Touchscreen (in) | — | — |
| Flywheel (lb) | 8 | 35.27 |
| Max user weight (lb) | 350 | 300 |
| Subscription required | No | No |
| Release | 2019 | — |
Sources — Keiser M3i Indoor Bike: keiser.com (verified 2026-06-15). Sole SB900 Indoor Cycle: soletreadmills.com (verified 2026-06-15).
What's the difference between the Keiser M3i Indoor Bike and Sole SB900 Indoor Cycle?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Resistance type: Keiser M3i Indoor Bike eddy current magnetic (non-contact) vs Sole SB900 Indoor Cycle magnetic (eddy current)
- Resistance levels: Keiser M3i Indoor Bike 24 vs Sole SB900 Indoor Cycle 100
- Flywheel (lb): Keiser M3i Indoor Bike 8 vs Sole SB900 Indoor Cycle 35.27
- Max user weight (lb): Keiser M3i Indoor Bike 350 vs Sole SB900 Indoor Cycle 300
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Keiser M3i Indoor Bike
Only one whitelisted source, Garage Gym Reviews, published usable prose for the exact Keiser M3i; Wirecutter, TechGearLab, Reviewed and Tom's Guide had no M3i review. GGR calls it a durable, extremely smooth, time-tested studio-grade bike it deems worth its $2,000-plus price, while flagging a primitive, small display and the lack of a built-in screen. (1 sourced review.)
Praised: Extremely smooth ride; Durable, time-tested build that fits riders 4'10"-7' with a 350-lb capacity; Cheap app access at only $6.99/mo for interactive programming.
Flagged: Primitive and small display; No built-in screen to view interactive programming; High price (more than $2,400).
Sole SB900 Indoor Cycle
Two whitelisted outlets review the exact SB900, but neither lab-measured it: Garage Gym Reviews openly states it has not tested the bike, and BarBend reports no measured numbers. Both praise the durable build, lifetime frame warranty, heavy 48-pound flywheel, and near-silent magnetic resistance, while flagging the small, bare LCD console and absent preset programs. They diverge on the resistance system's labeling and on Bluetooth support. (2 sourced reviews.)
Praised: Durable, high-quality build backed by a lifetime frame warranty; Smooth, near-silent magnetic (eddy current) resistance with heavy 48-lb flywheel; Seat and handlebars adjust vertically and horizontally to fit most riders.
Flagged: No preset or pre-programmed workouts and no built-in touchscreen; Small, basic LCD console with minimal tech; Resistance knob has no labeled levels; hard to return to a set level.