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Description
HKS Max 4 SP AP1/AP2 Full KitSingle Tube Damper Design Mono tube dampers allow for more accurate and stable control and adjustment of dampening. Lower ride height and center of gravity gives a more stable ride. Dust Boot Protect the shaft from the flying stones. PNE Coating Using this special surface coating provides 5 times better durability over standard galvanising. This prevents build up around the threads of the adjustment areas allowing for easier height adjustment. M Shaft
Single Tube Damper Design
- Mono tube dampers allow for more accurate and stable control and adjustment of dampening. Lower ride height and center of gravity gives a more stable ride.
Dust Boot
- Protect the shaft from the flying stones.
PNE Coating
- Using this special surface coating provides 5 times better durability over standard galvanising. This prevents build-up around the threads of the adjustment areas allowing for easier height adjustment.
M Shaft (?46 normal type)
- With the new design of cylinder shaft since the HIPERMAX M-1, MAX IV increased the cylinder shaft size to have a firm damping even at a little stroke range by optimizing the oil pressure characteristic. We mainly adopted this to the rear damper that can have a better driving experience.
Adopted Pillow Ball Upper Mount
- For more accurate and sharp steering.
New Design Needle
- Newly designed needle has been used to revise the very low speed and middle and high speed dampening which is key to a comfort ride.
Reduction of Unsprung Weight
- In order to reduce unsprung weight, bracket, ride height adjusters and lock nuts are made from aluminium. (Not for all vehicles)
30 Step Damping Force Adjustment
- 30 levels of dampening adjustment allow fine tune adjustment for street, circuit winding roads, highway, or the weight of the vehicle.
Specification:
| FRONT | REAR | |
| Damping force adjustment | 30 steps | 30 steps |
| Base valve | - | - |
| Height adjustable lower bracket | ? | ? |
| Upper mount | Spherical bearing | Spherical bearing |
| Inverted/Normal type | Normal | Normal |
| Damper/Spring layout | Coilover | Coilover |
| Spring rate change at factory | Possible | Possible |
| Damping force adjustment with wire | - | ? ?5 |
| Helper spring (Spring rate N/mm) |
? ( 19.8 ) | ? ( 19.8 ) |
Kit Information
- Spring of Full Kit
| F | R | |
| Spring rate N/mm(kgf/mm) | 157 ( 16 ) | 157 ( 16 ) |
| Free height (mm) | 170 | 150 |
| Spring type | Straight | Straight |
| Recommended range to change spring rate N/mm(kgf/mm) | ±20 ( 2 ) | ±20 ( 2 ) |
- Specification of damper
| F | R | |
| Damping force (Rebound/Damping)N* | 2000 / 500 | 1400 / 600 |
| Default position of dial | 15 | 15 |
| Remaining damper stroke (Rebound/Damping)mm | 38 / 47 | 50 / 50 |
- Setting Data
| F | R | |||||||
| Default | Test | Drivable limit High * |
Drivable limit Low * |
Default | Test | Drivable limit High * |
Drivable limit Low * |
|
| Length of case (mm) |
410 | ? | 438 | 405 | 292 | ? | 269 | 282 |
| Spring Set length(mm) |
L:212 / R:208 | ? | ? | L:224 / R:220 | 208 | ? | ? | 223 |
| Length to ride hight adjuster (mm) |
L:65 / R:69 | ? | L:93 / R:97 | L:48 / R:52 | 37 | ? | 60 | 12 |
| Lever ratio | 1.50 | 1.49 | ||||||
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.0 ★★★★★
Based on 21 reviews
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Product Reviews
★★★★★ 5
Perfect fit every time
Color: Silver, Size: 30W x 30L
These original 874’s are the real deal. Stocked up during the sale and got them for my husband. He loves all the colors and the durability of these pants is incredible. He still has some from 14 years ago!
But he wanted a few new ones- and they had more colors so I stocked up and surprised him when I told him how much they cost during the sale.
These pants never wrinkle. I wash them hot and air dry- no wrinkling or shrinking. They look great. They’re sewn to perfection. The quality is there and has been for years, a reason my husband only wears these.
Quality, value, durability, style, fit. Great for all seasons, they’re not too heavy or too light. Great functionality- pockets for everything . Great even in summer - they are very breathable. Perfect fit every time. Great for heavy road construction or just going for a hike.
Highly recommend!
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Reviewed in the United States on November 22, 2025
★★★★★ 5
Good work pants
Color: Dark Brown, Size: 46W x 32L
run small / snug I would recommend getting next size up minimum.
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Durable and great fit
Color: Black, Size: 32W x 34L
Great fit and quality, nice color, this are a work pants, pretty durable and they haven’t fade, also they don’t shrink or wrinkle
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Reviewed in the United States on April 15, 2026
★★★★★ 4
Run small, size it up
Color: Mushroom, Size: 32W x 30L, Color: Mushroom, Size: 32W x 30L
They go small, Im 5'8", 165lbs, usually 32x30 fits just rigth in most brands Levis, Izod, whatever, can't even close the zipper on this one, my dingus prints in the front if I manage to close it, I will try a 34 or even 36, if you want one, size it up. Length is right.
Anyway, the pant is good, sturdy looking material, is not soft but nothing uncomfortable probably gets right after break it in, reinforced stitches on pockets. I think they would work great for a technician, salesman or an engineer, those jobs where you have to look like a human being with a polo shirt but sometimes needs to do something without ripping your pants while crouching or for daily abuse of the regular Joe, will try another that fits
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Reviewed in the United States on May 28, 2026
★★★★★ 5
Best Value For The Money
Color: Black, Size: 36W x 32L
My grandson uses these for work. Well-made and durable. Worth the price. Fit is comfortable.
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Reviewed in the United States on April 13, 2026