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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Ships within 48 hours · Estimated delivery Jul 13 - Jul 18

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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 586 reviews
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Product Reviews
K
Verified Purchase
KrissieB
Birmingham, US
★★★★★ 5
Nice Backpack
Color: Beige
Nice soft beige color. A perfect backpack for me to take to work and school.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 18, 2025
P
Perry Brown
Waukegan, US
★★★★★ 5
Great to take on a trip
Color: Black
We love to cruise and always take an extra backpack with us so we can load up on the travel booty and have a place to put it. Works well as your "one plus" item on the airlines. So the quality on this backpack is just fine. No issues at all. Nothing was falling apart or coming off. Very small when you fold it up which is great for packing in your suitcase. Holds a ton of stuff.... I'd do some shopping to make sure this fits your needs. There are a ton of backpack's in this price range and some appear to have more features.... Also looks... some are cooler looking, but that's just my opinion...even though I'm right... This will do well for you as others will do too... You get a 30 day return policy with this so you could try it out first to see if you like it... if not, return it... nothing to loose...
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 21, 2025
D
D. Hopson
Cuba, US
★★★★★ 5
Decent basic backpack
Color: Green
This is a good, basic backpack. It doesn't have a lot of bells and whistles, but it's a solid choice. The sizing is average, it will hold several books and notebooks. The padding felt adequate for most items, but I'm not sure how much I would trust it with an expensive Mac book. The straps were easy to adjust and padded enough. I appreciate that it could be folded up and put into another bag if you needed an extra bag while traveling - it would make a good day pack. Overall a good deal for what it is.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 18, 2025
A
Anne Swan
Pawtucket, US
★★★★★ 5
Sturdy, attractive, comfortable, large capacity; lightweight, back strap to fit luggage
Color: Green, Color: Green
There are several good features for this BAGOK Lightweight Nylon Backpack, starting with the attractive green color that I chose. It is light weight and foldable yet has lots of pockets. The stitching is good, and the zippers work nicely. The back adjustable straps have padding and netting for cooling. There is also a handle on top for carrying and a backstrap to fit over luggage. On the front, there are two zippered compartments. The small one at the top could hold a wallet or passport or tickets. The larger front pocket is roomy with the zipper under an overhanging fabric. Inside is lined with black nylon. The frontmost large compartment extends the length and width of the backpack. The larger main compartment is at the back and has padding to safely store a laptop, e reader or other electronics. There are two nylon pockets inside the main compartment on one side. There are two outer side pockets. I was able to fit a water bottle in them when the inside was empty. However, if the entire backpack is filled, I don't think a water bottle will fit. One drawback is the side pockets are not elasticized--they don't stretch. I will use this for day trips and travel. It is too large to be a personal item on airlines, but it could be a carryon. You can get a lot of things in it. The nylon material is sturdy and should stand up to wear. I am short, 5'2" female and I could adjust the straps to be comfortable for me. And it does fold up for storage between uses. This could also withstand daily use for hiking, work or school
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 3, 2025
M
Verified Purchase
mona najajreh
Phoenix, US
★★★★★ 5
Finally found the perfect backpack!
Color: Apricot, Size: 17.3 Inch
I’ve been searching for a backpack that could fit my 16-inch laptop and my other uni stuff since i commute, without looking huge on me, I’m a small girl, so most big backpacks just look bulky and awkward. I wanted something slim and sleek, not one of those backpacks that stick out and have that “belly” shape. After a lot of searching, I finally found this one, and I absolutely love it! The material feels really high quality, and the design is just perfect. I got the 17-inch size, and it fits my 16-inch laptop comfortably. There are so many pockets for organization, plus a separate padded compartment just for the laptop, which I really appreciate. It also has a handle that easily slides over my suitcase handle, which is so convenient for traveling (I travel a lot, so this feature was a must). It’s comfortable to wear, the straps are adjustable, there are bottle holders on both sides, and overall it just looks clean and stylish. i got the beige color one. which i love. I’m really happy with this purchase it has everything I was looking for. I’ll attach a short video showing all the pockets and features because it honestly deserves it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 10, 2025

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