Research-based buying guide · Specifications checked October 9, 2026.
A four-post and a six-post setup can offer the same cable exercise categories while giving a barbell, bench and lifter very different places to work. Our comparison turns the purchase into three checks: the supported rack version, the usable training zone, and the complete installed quote.
Standard Ares 2.0 configurations
| Configuration | Supported rack / crossmembers | Buying implication |
|---|---|---|
| Standard 4-post Ares 2.0 | Current PR-5000; 16-in crossmembers | Compact front-of-rack training route; plan appropriate external safeties and stabilization |
| 6-post Ares 2.0 on PR-4000 | Front bay: 16, 24, 30 or 41 in; rear bay: 16 in | 16-in rear crossmembers need vertical holes; front depth determines usable lifting space |
| 6-post Ares 2.0 on PR-5000 | Front bay: 16, 30 or 41 in; rear bay: 16 in | Verify current 1-in-hole rack version; original alternating-hole PR-5000 is a different fit question |
These are the manufacturer’s standard attachment configurations. Omni, Apollo and HR-5000 V1 flat-foot racks are excluded. A matching tube size on another brand does not prove Ares fit. Confirm the exact cable package whenever changing rack depth; REP says a depth change requires a different cable length.
Four posts do not guarantee the smallest working footprint
REP requires the standard four-post setup to be bolted down or stabilized with Mini Front Foot Extensions at both the front and rear. Count those extensions when taping the floor layout. For six posts, REP says bolting is not required for the Ares configuration but still recommends it. Follow the current instructions for your complete installation.
Separate the frame from the working zone. Leave room to load both bar ends, move the bench, sit at the row station and move through cable exercises. An unobstructed outline can still place your shoulders or bench against the stacks. Put tape on the floor and mock up your flat, incline and unracking positions before selecting the bay.
Six-post benefit: a deeper front bay lets you compare a genuine inside-rack lifting zone with the rear cable bay. Six-post limit: the shallow 16 + 16 layout does not automatically create that room. Choose safeties compatible with every installed attachment, then verify where the free bar and bench will travel.
Use the REP garage ceiling and clearance worksheet for the installed-height, flooring, door-travel and bar-loading checks. Neither post count fixes a low ceiling or inadequate pull-up clearance.
Standard four-post Ares is not the Summit Smith package
The newer Summit Ares 2.0 package uses a distinct 26-inch four-post configuration with Smith functionality. Do not transfer its compatibility to the standard 16-inch four-post Ares retrofit. A Smith can change bench access, conventional safety compatibility and pull-up options. Our REP Smith, Ares and Athena configuration matrix keeps that decision in one place.
For an existing rack, list exactly what can be retained. For a new gym, compare complete configured systems with the same exercise requirements. The lowest attachment price is an incomplete comparison when one quote requires another rack or replacement accessories.
Compare complete four-post and six-post quotes
Enter current US dollar quotes. Put 0 only when an item is included or genuinely unnecessary. The published $2,999.99 attachment starting price seen on both standard product pages on October 9, 2026 excludes the power rack; it is not a complete system price.
Keep common costs consistent: include your bench, bar and plates in both totals if buying them; omit them from both when already owned and compatible. Keep optional stack upgrades separate until your training actually requires them. A more expensive build only earns its space and cost when you will use its extra working zone.
Which should you buy?
- Choose standard four-post when you have the supported PR-5000, can meet its stabilization requirements, and front-of-rack barbell work fits your training.
- Compare a deeper six-post build when inside-rack squats or presses and bench positioning are central. Select actual front-bay depth rather than assuming six posts solve clearance.
- Keep the simpler setup when a sound existing rack plus a cheaper compatible pulley covers your exercises. Avoid paying for duplicate lat/row capability.
Next, compare PR-4000 vs PR-5000 attachment standards or check bench length and accessory compatibility. The Home Gym Planner helps decide whether rack, bench, barbell or dumbbell equipment deserves your budget first.
Research and purchase checks
Primary sources: REP standard four-post Ares 2.0; REP six-post Ares 2.0; REP Summit package; REP rack, Smith and cable configuration guide. Manufacturer specifications and compatibility are dated October 9, 2026. The diagram and cost worksheet are our original planning tools; they do not certify structure, anchoring, dynamic clearances or safe lifting.