Smirthwaite
Smirthwaite Hardrock Chair Accessories
Stabilizers, pelvic support, pommel, tray parts
From $86.35
Lower 48 and DC only. No Alaska, Hawaii or U.S. territories.
Smirthwaite · Seating & Positioning
Smirthwaite Hardrock Chair
From $4,074.28
Plus $175 lift-gate delivery, once per order
Ships to the lower 48 states and DC only. Not to Alaska, Hawaii or U.S. territories.
Pay over time with Affirm or Klarna at checkout, subject to eligibility.
Smirthwaite designed the Hardrock for children through adults who rock repetitively. Its heavy-duty build is meant to stand up to continuous movement and high-impact rocking, and it gives moderate postural support at school or at home.
- Built for repetitive rocking
- Anti-thrust seat, anterior pad
- Moderate postural support
- Size 5 up to 331 lb
Delivered by lift gate and ships free; the lift-gate delivery is its only delivery charge. We pay the sales tax. Most products are processed within 2-5 business days. Shipping and returns
Questions? Call (844) 799-0070
Accessories For This Model
About The Hardrock Chair
An anti-thrust seat and anterior pad keep the pelvis aligned. Four sizes are offered. Size 2 has a 10.2-16.1 inch seat height for users up to 132 pounds; Size 3 runs 11.4-17.3 inches and 154 pounds; Size 4 runs 14.8-20.7 inches and 198 pounds; and Size 5, with a 25.6-inch high back, runs 16.7-21.7 inches for users up to 331 pounds. Optional thoracic supports and stabilizers help users who move sideways.
Sizes 2 and 3 come with adjustable armrests, an anti-thrust cushion, a tray, a buckled pelvic strap with pad and a transporter base; Size 4 has the same with a mobile base and push handle. The chair comes fully assembled, and Smirthwaite warrants materials and workmanship for 2 years.
Specifications
- Seat height (Size 2)
- 10.2-16.1 in
- Max user weight (Size 2)
- 132 lb
- Seat height (Size 3)
- 11.4-17.3 in
- Max user weight (Size 3)
- 154 lb
- Seat height (Size 4)
- 14.8-20.7 in
- Max user weight (Size 4)
- 198 lb
- Seat height (Size 5)
- 16.7-21.7 in
- Max user weight (Size 5)
- 331 lb
- Product weight (Size 2)
- 77 lb
- Product weight (Size 5)
- 132 lb
- Back height (Size 5)
- 25.6 in (high back)
- Base (Size 2, Size 3)
- transporter base
- Base (Size 4)
- mobile base with push handle
In The Box
- Size 2 and Size 3: adjustable armrests, anti-thrust cushion, tray, buckle pelvic strap with pad, transporter base
- Size 4: adjustable armrests, anti-thrust cushion, tray, buckle pelvic strap with pad, mobile base with push handle
Warranty
- Materials and workmanship: 2 years from date of delivery
- Excludes accident, neglect, misuse, not following the instructions, and normal wear and tear
- A charge may apply where goods cannot be repaired under the warranty; you are advised first
- Claims: Smirthwaite Customer Services advises on next steps
- In addition to your legal rights
Specifications and warranty terms are from the maker: smirthwaite.com, smirthwaite.com, smirthwaite.com. Checked October 13, 2026.
What Our Customers Say
Google reviews of our company and our technicians, not of this one product.
★★★★★
4.6 rating of 101 Google reviews
Mason is a wonderful service technician! We live in “rural country” of NE Georgia and he drove all this way to get my Dad’s chair lift up and running. Thank you, Mason AND Custom Mobility!
As a fellow business owner, I have seen this company do all of their work with as much professionalism and tact as any that I have ever encountered. I thoroughly enjoy actually witnessing people who care about their work and show it through their actions, and the owner at Customer Mobility is the ep…
My Service Technician is truly the best! He responded within a day and he fixed the chairlift in less than an hour! It’s reassuring to know that we can depend upon Custom Mobility!
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Talk To A Mobility Specialist
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