Body-Solid's Series 2 arm machines look similar at a glance, but the S2ACX and S2BTPX solve two different problems on a commercial floor. If you're comparing S2ACX vs S2BTPX for your gym, the real question isn't which one is "better" — it's whether you need a dedicated biceps station or a single machine that covers both biceps and triceps. Here's how the two actually differ.
Both machines belong to Body-Solid's Pro ClubLine Series 2 family and share the same 160 lb. standard weight stack (with a 235 lb. upgrade option), so the decision comes down to exercise coverage and footprint rather than build tier.
S2ACX Series 2 Arm Curl
Price: $2,795 | Weight Stack: 160 lbs. standard (235 lb. upgrade) | Dimensions: 41" x 51" x 57" | Product Weight: 380 lbs.
The S2ACX Series 2 Arm Curl is a dedicated preacher/arm-curl station — it's built to do one movement extremely well rather than double up on exercises. Its compact 41" x 51" footprint is the smallest of the two machines, which makes it a good fit for gyms that already have triceps coverage elsewhere (a pushdown station, cable column, or dip machine) and just need a focused biceps unit to round out the arm-day circuit.
Best for: Gyms that need a dedicated biceps/preacher-curl station and already have triceps work covered by another machine.
S2BTPX Series 2 Biceps and Triceps
Price: $3,140 | Weight Stack: 160 lbs. standard (235 lb. upgrade) | Dimensions: 52" x 43" x 84" | Product Weight: 400 lbs.
The S2BTPX Series 2 Biceps and Triceps combines both exercises into a single station, which is reflected in its taller 84" height and larger overall footprint compared to the S2ACX. For gyms trying to consolidate floor space, this is the more efficient buy: one machine, one weight stack, two movement patterns covered instead of needing two separate pieces of equipment.
The tradeoff is price and footprint — at $3,140 it costs about $345 more than the S2ACX and takes up more vertical space, which is worth factoring in if ceiling height or floor plan is a constraint.
Best for: Gyms that want biceps and triceps coverage from a single station and are working with limited floor space for multiple machines.
Quick Comparison Chart
| Model | Price | Key Spec | Best For |
|---|---|---|---|
| S2ACX Arm Curl | $2,795 | 160 lb. stack, 41"x51"x57", 380 lbs. | Dedicated biceps/preacher-curl station |
| S2BTPX Biceps and Triceps | $3,140 | 160 lb. stack, 52"x43"x84", 400 lbs. | Combined biceps + triceps in one machine |
Why Buy From Everything Gyms?
As an authorized Body-Solid dealer, Everything Gyms ships both of these Series 2 machines direct from Body-Solid's warehouse near Chicago, with free nationwide shipping, a price match guarantee, and the full manufacturer warranty on every order.
Frequently Asked Questions
S2ACX vs S2BTPX — what's the actual difference?
The S2ACX is a biceps-only preacher/arm-curl machine, while the S2BTPX is a combined station that covers both biceps and triceps exercises in one machine.
Is the S2BTPX bicep tricep machine price worth the upgrade over the S2ACX?
The S2BTPX costs $3,140 versus $2,795 for the S2ACX — about a $345 premium for covering two movement patterns instead of one, which can be worth it if floor space is limited.
Do the S2ACX and S2BTPX use the same weight stack?
Yes, both ship with a 160 lb. standard weight stack and offer the same 235 lb. upgrade option.
Which Body-Solid Series 2 arm machine is right for a commercial gym?
If you already have dedicated triceps equipment, the S2ACX covers biceps efficiently at a lower price. If you're consolidating arm training into fewer stations, the S2BTPX's combined design covers more ground per square foot.
Ready to add Series 2 arm training to your floor? Shop the S2ACX Arm Curl and S2BTPX Biceps and Triceps at Everything Gyms, an authorized Body-Solid dealer with free nationwide shipping.