SKU: 3968979646

Sirris F43 CMX Front Fork for Surron LBX | E Ride Pro S / SS 2.0

$1458.90 $1621.00
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USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Aug 10 - Aug 15

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For Your Every Summer RSVP, with Code: SUMMER15

Description

Sirris F43 CMX Front Fork for Surron LBX | E Ride Pro S / SS 2.0RIDE IT ONCE. REGRET EVERYTHING ELSE. F43 CMX THE WORLDS BEST COMPACT E MOTO FORK. PERIOD. An oversized, race built F43 chassis paired with our CMX tuned closed cartridge damper built for elite control, razor sharp handling, and unreal front end confidence. This is the strongest, most durable, highest performance fork available. You need to ride it to believe it. Its that good. Bike Fitment: Surron LBX Surron LBS E Ride Pro S E Ride Pro SS 2. 0 SPRING

RIDE IT ONCE.
REGRET EVERYTHING ELSE.

F43 CMX

THE WORLD’S BEST COMPACT
E-MOTO FORK. PERIOD.

An oversized, race-built F43 chassis paired with our CMX-tuned closed cartridge damper — built for elite control, razor-sharp handling, and unreal front-end confidence. This is the strongest, most durable, highest performance fork available.

You need to ride it to believe it.
It’s that good.

Bike Fitment:

  • Surron LBX
  • Surron LBS
  • E Ride Pro S
  • E Ride Pro SS 2.0

SPRING RATE CHART:

Sirris offers two weight ranges when selecting your CMX Tune F43 fork for Surron Light Bee X (LBX). (Listed weight ranges are rider weight without riding gear on. 15 pounds of riding gear is calculated into the weight ranges)

140 lbs - 180 lbs  (Medium = 3.6/3.2 springs)
180 lbs - 220 lbs  (Heavy = 3.6/3.6 springs)
Fork spring rates listed above are left side/right side.

Installation Guide:

TOOL-FREE COMPRESSION ADJUSTERS

NEW FOR CMX — Allows for quick compression adjust without a screwdriver.
Enjoy nearly 30 clicks of quick external adjustability.

DIRECT MOUNT STEM

DM READY — New CMX fork is designed with a Direct Mount (DM) setup, so the stem you’re already using will bolt right up—no hassle, no extra parts.

DROP CLAMP OPTION

BIG WHEEL OPTIONAL — Allows for fitment of 21” wheel by raising the front end an additional 25mm while retaining 220mm travel. (Raising the front end maintains balance of the bike if paired with a longer shock that raises the rear)

NEW AXLE & BRAKE MOUNTS

ULTRA STIFF AND CONFIGURABLE — Axle and drop out assembly promotes front end feel and steering precision. Replaceable caliper mount brackets allow for caliper upgrades.

FORK SPECS:

Architecture
Upside down fork

Travel
220 mm

Free length
775 mm
(drop clamp option adds another 25mm of extended length)

Fork Spacing
178 mm - allows for unlimited tire choice (dirt or street)

Fork weight
4 kg per leg (driven by sturdy construction required for the forces and speeds encountered when pushing these bikes to their limits without compromising performance)

Stanchions
Ø43, high tensile steel with hard chrome

Outer tubes
Seamless 7050 aluminum, type 3 hard anodized coating

Drop outs
6061 aluminum, type 2 anodized coating
Replaceable caliper mount brackets allow for caliper and wheel upgrades

Axle
Ultra-high tensile hard chromed axle increases steering precision and confidence

Triple clamps
Billet 6061 aluminum, type 2 anodized coating, 2 color options (blue, black)
Optional drop clamp allows for 21” front wheel conversion (black only)

Steer tube 
Seamless 7050 aluminum, type 2 anodized coating

Damping
Symmetrical, adjustable closed cartridge with spring backed modified IFP

Damper bodies
Seamless 7050 aluminum, type 3 hard anodized coating

Rebound
Dual side high tensile steel spring, adjustable

Adjusters
External tool-free compression, rebound adjustment
(rebound adjusted using tool)

Seals
NOK MX seals 

Bushings
Daido MX bushings

Guards
High impact PP, 210-degree wraparound

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: 3968979646

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4.6 ★★★★★
Based on 27 reviews
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Product Reviews
T
Todd Widner
San Leandro, US
★★★★★ 5
Rope is made of durable material
It is extremely sturdy and durable; Even if my dog pulls hard, it won't break. My dog is absolutely irresistible and gets excited every time he plays. Its design is very convenient for both of us, whether indoors or outdoors, it can effectively help my dog consume excess energy.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 9, 2026
J
Verified Purchase
Jennifer Z
Los Angeles, US
★★★★★ 5
A Must for your Pup!!!
Pattern Name: Heartbeat Sheep White, Pattern Name: Heartbeat Sheep White
I adopted my puppy at six weeks and it was so hard for her to transition from leaving her mom and litter mates to my home. She would be whining and crying most of the time. I tried the water bottle with an old shirt of mine method which seemed to work, and I got on amazon in search for a plush that could soothe her. I came across this product, and I chose this one over the brand name because I thought the sheep was very cute lol. I recommend this product 100%! My pup loves to sleep with it and I immediately noticed a difference as she was soothed to sleep with this plushie. With or without the heartbeat, she loves to sleep with it regardless! I would love if this product, if the insert at the bottom could have more space as I would like to insert a heat pack to keep her warm. Also, my pup ripped out the nose stitches so just be careful with your pups as they may swallow the stitching! Overall, I love this product and I recommend getting your hands on one of these before your pup comes into your home. It’ll make the transition from mom to home much smoother.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 23, 2022
A
Verified Purchase
Annabelle Williams
New York, US
★★★★★ 5
Best investment to ease the transition for a new puppy!
Pattern Name: Heartbeat Sheep Grey
This toy is well made, the heartbeat sound that it makes is strong, and my puppy has loved it from day one! I just got a new Chihuahua mix puppy and the transition into our house was made so much better by all of us (the puppy, me and my other dogs) getting a good nights sleep each night because of this toy. My puppy snuggles with it in her crate and falls asleep very quickly. I'm sure it helps her feel like she is not alone and is very soothing. This is hands down the best thing I bought when planning for my new pup!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2025
M
Verified Purchase
Marie Phillips
Whiting, US
★★★★★ 4
Helpful Idea for Puppies, Even Though Mine Were Not Interested
Pattern Name: Heartbeat Sheep Grey
This heartbeat puppy toy is a really thoughtful concept for helping puppies feel comforted during crate training and sleep, especially for very young puppies adjusting to a new environment. The heartbeat feature and soft plush design are clearly meant to create a calming effect and ease anxiety during transitions. The toy itself feels soft and well made, and I can absolutely see why many puppies respond well to it. In our case, my puppies personally were not very interested in it, but I honestly feel that was more about their individual personalities than the product itself. Because the concept is so good and many dogs may benefit from it, I still think it is worth trying, especially if introduced very early during puppy training and adjustment periods.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 7, 2026
L
Verified Purchase
Lil Miss Book Worm
Lexington, US
★★★★★ 5
Did they add pheremones to this??
Pattern Name: Heartbeat Sheep Grey
So when my puppy first came home to me I bought this to try to help him keep calm through the night. He wasn't able to sleep through the night, but he did sleep more than I had expected. The next couple of nights he was able to sleep through the night completely (but liked to wake up at 5 am...). Fast forward to a month later, and I no longer turn the heart on all the time (because I forget). But I did buy a re-chargeable heart because having to keep buying batteries is a pet peeve for me. He still loves to sleep with it as it's another snuggle spot that helps keep him warm (short haired mini dachshund, so not much fur to keep himself warm) in the kennel. During the day though, he loves to drag this thing out of the kennel and "wrestle" with it. He shakes it a lot like all dogs like to do to "kill" it, and he's chewed the tail and nose worn. But the reason I say it has pheremones is that at 10 weeks old (which was younger than my last dogs' puberty age), he's humping it like there's no tomorrow. If I need to get his attention, or keep him out of a certain area, all I need to do is bring this out of kennel, and he's off humping the stuffing out of it. His brother (who belongs to my mother and is from the same litter), does the same thing. So now I have to wonder if they added some pheremones to it so that it's really "lovable". It was actually pretty hilarious because I was face-timing my mother showing her my dog with this anxiety toy, and he decided to perform his first humping act on air. So I'm not sure I can say it did it's main job to calm anxiety, but it did act as companion (in more ways than one) to my dog. My dog is almost 4 months old now and this toy is still going strong... well, the neck could use a sew, and the tail is on it's last leg, but he loves his girlfriend just the way she is.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 26, 2021

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