SKU: 84425721479

M7 Speed MINI Cooper R53 Super Lightweight Crank Pulley | 4%

$143.95 $159.95
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Ships within 48 hours · Estimated delivery Jul 18 - Jul 23

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Description

M7 Speed MINI Cooper R53 Super Lightweight Crank Pulley | 4%The M7 Speed 4% oversize speed increasing crankshaft pulley will add power, acceleration and performance to your MINI. Speeding up your supercharger safely adds "low end" boost and torque which gets your MINI Cooper going. Weighing in at a scant 13 ounces, (an amazing 88. 5% less than factory) the lightweight M7 Speed 4% Crank Pulley reduces crankshaft rotational mass which equals additional increased horsepower, torque and throttle response. Design

  • The M7 Speed 4% oversize - speed increasing crankshaft pulley will add power, acceleration and performance to your MINI. ‚ Speeding up your supercharger safely adds "low end" boost and torque which gets your MINI Cooper going. Weighing in at a scant 13 ounces, (an amazing 88.5% less than factory) the lightweight M7 Speed 4% Crank Pulley reduces crankshaft rotational mass which equals additional increased horsepower, torque and throttle response.‚

    Design

    This beautiful design is a result of advanced computer modeling and high precision CNC machining. Made in the USA from billet 6061-T6 aerospace grade aluminum alloy and finished with a deep black anodized coating and laser etching. ‚ The Micro V-Belt grooves are machined to exacting SAE J1459 specifications for minimum belt slippage at maximum boost. Use this in combination with the M7 Speed 16% Supercharger Technology Pulley for maximum performance and boost yourself to the next level of MINI tuning and performance.

    ‚ From the factory, the MINI suffers from no positive drive key on the crankshaft snout to drive the lower pulley. The factory pulley is press fit onto the crank. All aftermarket pulleys are slip fit at best and rely on the bolt to provide adequate clamp force to prevent the pulley from slipping.‚ The M7 Speed crank pulley is engineered with an interference fit onto the crankshaft eliminating pulley slippage on the crankshaft.

    Features

    • Super Lightweight. Weighs in at 13 ounces (0.3 kg)
    • Save 6.2 lbs (2.8 kg) from stock
    • Reduces damper weight by an‚ amazing 88.5%!
    • Prefect balance is achieved by symmetric design and high precision machining.
    • Industry exclusive interference thermal fit to eliminate high RPM slippage on the crankshaft.
    • Supplied with a brand new high quality ARP Racing bolt and precision ground flat washer
    • Micro V-Belt grooves are machined to exacting SAE J1459 specifications

    Installation

    Simple to install. Heat the pulley to 275/300oF (135/150oC) in your kitchen oven or using a small propane torch and heat gun and the pulley will drop straight onto the crank. When it cools it will be super tight onto the crank. Finish the installation with the supplied ARP bolt and precision flat washer and presto...more power, more reliability and more overall performance for your supercharged MINI Cooper.

    PROUDLY MADE IN THE USA




Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 84425721479

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4.1 ★★★★★
Based on 29 reviews
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Product Reviews
M
Verified Purchase
Marsha
Waukegan, US
★★★★★ 4
Beautiful sturdy, cozy chair, BUT…..
Color: White, Color: White
Updated review. I was so excited to get this chair that I jumped the gun and wrote the review prior to spending more time seated. I only have one issue, which is the back bottom of the seat cushion. That’s a big deal. It appears so thick, fluffy and inviting, however, when I sat in it for a couple of hours it completely went flat in the back feeling like I was sitting on a board. I’m 5’4” 180 lbs, which means my feet don’t touch the floor so adding a cushion will elevate me a little more. I’m OK with that but it’s going to ruin aesthetic of the chair which is which is not ok. I do love the idea of this chair. It’s design and the color. I wish the seat cushion had a zipper, which would eliminate my issue. I’d say if you’re someone who has to spend a lot of hours in this chair, you probably won’t like it. I do like the reclining back and the foot rest. It is comfortable to lay back but that doesn’t change the issue in the back bottom of the seat cushion. I absolutely love this chair, I didn’t want to get up. It’s beautiful and cozy. Assembly was easy as I’ve assembled chairs before. I changed the wheels to a double roller blade easy on hard wood floors. I also scotch guarded the entire chair. This chair is sturdy and well made.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 25, 2026
L
Verified Purchase
Lauren
Grantham, US
★★★★★ 5
just get it and stop second guessing
Color: White, Color: White
I reallllly love this chair. I almost talked myself out of it because of some of the bad reviews here and there but i’m glad i listened to a majority of the good reviews, because this chair is perfect. shipping: it was super fast. it came 5 days earlier than expected. I got it on a Monday when it said it’d be here on Friday packaging: double boxed and bubble wrapped. Didn’t find any dings or scratches on anything. all parts were there including instructions assembly: my boyfriend put it together in 40 minutes. We didn’t have any issues zipping up the back cover like other reviews said and he said it was easy instructions to follow, and easy to put together. size and comfort: it’s bigger than the pictures let on! I’m 5’3 135lbs and feel like I’m sitting on a giant cloud. The comfort is 10/10. I just had a chair with basicslly zero butt cushion which i cannot have while working from home 8+ hrs a day in a chair. Comfort was the most important for me and I finally can’t feel the flat seat under me. I can’t express how comfy it is. Functions: can move the arm rests up and down. adjust the back to tilt all the way back to a sleeping position or fully upright which i didn’t even realize was a function! The only thing with the armrests; if you’re wanting your pet on it (like advertised) when the arm rests is put down there is a big gap that isn’t comfortable for animals (as pictured) so I have to put a blanket or pillow there for my small dog to lay comfortably. I’m obsessed with the fact I can sit cross legged, normally, laying down, sprawled up, or legs up. I have room to sit however I want, and the foot rests helps a ton with feeling even more comfortable. Overall, I’d get this chair 10x over. Not only do I work from home and spend hours in a chair, but I spend additional time playing video games so a good quality chair is very important to me. This has began to help fix my posture and back and neck issues. Get it!!!
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Reviewed in the United States on February 24, 2026
J
Verified Purchase
Jessica
Grantham, US
★★★★★ 5
If You Sit Weird Like Me… Just Buy This Chair
Color: Galaxy Black
I work from home and spend a lot of time sitting for hobbies like Legos, PC games, and crafts—so a comfortable chair is a must. I LOVE this chair so far. I’ve always struggled to get comfortable in traditional office chairs, and the ability to move around is really important to me. With this one, I can easily cross my legs, use the footrest to stretch out with my knees bent, or just sit normally. I’m 5’4”, so my feet don’t quite touch the ground, but that doesn’t bother me since I’m constantly switching positions anyway. I’ll probably add a small pillow for extra back support and maybe fold a blanket for a bit more seat cushioning. It’s comfortable overall, but after long periods of sitting, you might start to feel it. The black sparkle version is MUCH cuter in person, and I’m so glad I went with it. A lot of reviews say, “don’t think about it, just get it”—and honestly, they’re right. I debated for a couple weeks before buying, and I have zero regrets. Assembly was easier than I expected. I tend to get frustrated putting things together, but this was pretty painless. One tip: check inside the cushioned back piece for the extra headrest part—you’ll need it to attach to the hard back before inserting it into the cushion. Once I figured that out, the rest was simple. The chair is a bit larger than a standard office chair and can feel a little bulky depending on your desk setup, but I actually like the extra space since I move around a lot while sitting. It feels sturdy and well-made. It’s also slightly warmer than a mesh chair, which I personally love because I’m always cold. I am just happy to find a chair that feels comfortable like a recliner and movable like an office chair.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 20, 2026
S
Verified Purchase
Space Coven
Alexandria, US
★★★★★ 5
Great chair
Color: Pink
I love this chair! I use it for streaming and working on making jewelry! It’s very comfortable and I love that I can sit different ways in it! I can stream longer than I could in other computer chairs I’ve had! I definitely recommend this if you have to sit for a long time but like to sit in different positions! The instructions were a bit confusing but I did figure it out! I have had to spot clean it a few times because of kids and pets but the material has held up! The back is very comfortable and supportive! I like that I can adjust it! Great chair for the price! It’s held up well and I like that you can adjust the back!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 11, 2026
A
Verified Purchase
Allen
Alexandria, US
★★★★★ 4
Good office chair for the money
Color: White
It is a good quality chair that is comfortable and aesthetically pleasing. The arms aren't necessarily big enough to hold our cat - but that's because he's fairly large by cat standards. The arm rests moving is definitely nice and provides lots of opportunities to 'setup the chair' in a way that works best for you. The instructions were relatively easy to follow (take your time and think it through to make sure you have everything 'aligned right' at first) and the chair is sturdy and holding up well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 17, 2026

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