The Rudy Project Kelion is engineered for cyclists and endurance athletes who demand cutting-edge performance, razor-sharp optics, and full prescription compatibility. With its RX insert system, wide field of view, and advanced ImpactX® photochromic lenses, it’s built to adapt to any ride whether you’re racing in blinding sunlight, tackling shaded woodland trails, or grinding through unpredictable weather.
Warranty & Authenticity
When you buy the Rudy Project Kelion, you’re investing in world-class Italian cycling eyewear backed by a trusted warranty.
2-Year Manufacturer’s Warranty: Covers defects in materials and workmanship.
Crash Replacement Programme: Rudy Project offers lens replacement options in case of accidental damage.
Authorised Retailers: Buying from trusted outlets like Extreme
Eyewear UK guarantees genuine parts, prescription insert support, and aftercare.
Spare Parts & Lenses: Frames, nosepads, temples, and lenses are replaceable extending the life of your sunglasses.
The Rudy Project Kelion is engineered for cyclists and endurance athletes who demand cutting-edge performance, razor-sharp optics, and full prescription compatibility. With its RX insert system, wide field of view, and advanced ImpactX® photochromic lenses, it’s built to adapt to any ride whether you’re racing in blinding sunlight, tackling shaded woodland trails, or grinding through unpredictable weather.
Why Cyclists Love the Kelion
Revolutionary RX Insert System: The Kelion is fully compatible with Rudy Project’s lightweight optical insert, allowing riders to use their exact prescription without compromising aerodynamics or comfort.
ImpactX® Photochromic Lenses: Automatically adjust to changing light, giving you perfect vision in bright sun, mixed light, or cloudy conditions. Available in tints such as Laser Purple and Laser Red for maximum contrast.
Panoramic Wraparound Coverage: Wide lens geometry ensures a seamless field of vision with no blind spots.
Advanced Ventilation: Integrated PowerFlow™ system channels airflow to minimise fogging while maintaining protection.
100% UVA & UVB Protection: Blocks harmful rays so you can train longer and harder in all conditions.
Featherlight Construction: Weighing only 32 grams, the Kelion delivers all-day comfort even on ultra-long rides.
See the Road Differently
The Rudy Project Kelion doesn’t just protect your eyes it enhances your vision and performance.
Superior Optical Clarity: ImpactX® 2 lenses are engineered to resist shattering while delivering distortion-free clarity.
Adaptive Photochromics: Lenses automatically lighten or darken based on environmental light, so you’re never caught out when the sun disappears or suddenly reappears.
Contrast Enhancement: Specialised tints like Laser Purple sharpen contrast and improve depth perception, ideal for road cycling, gravel riding, and mountain descents.
Wide VLT Range: Options from 11% (bright sunlight) to 28% (cloudy conditions) mean you can choose the right level of light transmission for your discipline.
Full RX Customisation: With the prescription insert fitted, you experience seamless vision correction without the bulk of wearing standard glasses under your cycling eyewear.
Fit, Comfort & Protection
Cycling eyewear needs to be secure, comfortable, and distraction-free. The Kelion is designed with ergonomic precision:
Adjustable Nosepiece & Temple Tips: Fully customisable fit that prevents slipping, even when sweating or riding in aggressive aero positions.
Ventilation Without Compromise: Rudy Project’s signature PowerFlow™ technology allows constant airflow while shielding eyes from wind and dust.
Impact Protection: Polycarbonate lens construction offers resistance to debris, insects, and unexpected road hazards.
Helmet Compatibility: Low-profile temples sit securely under most cycling helmets without creating pressure points.
Ergonomic Wraparound Frame: Lightweight yet durable, the Kelion balances snugness with flexibility, giving a “barely there” feel during intense rides.
Style & Versatility
The Kelion isn’t just about function it makes a bold style statement on the road.
Sleek, Aerodynamic Frame: Minimalist yet aggressive, the design is tuned for performance.
Mirror & Tinted Lens Options: From Laser Purple to Multilaser Red, the lens options not only enhance vision but also create a distinctive, pro-level aesthetic.
Multiple Frame Colours: Choose between gloss finishes like Black Gloss or Crystal Ash to match your kit and bike.
Unisex Design: A versatile shape that works for both men and women, with a one-size-fits-most frame.
Day-to-Day Versatility: While optimised for cycling, the Kelion works just as well for running, triathlon, and general outdoor sports.
Prescription Inserts (RX Insert)
The standout feature of the Kelion is its compatibility with Rudy Project’s innovative RX optical insert.
Clip-In Design: The insert snaps in securely behind the main lens, staying invisible to others while giving you perfect clarity.
Full Field of View: Unlike wearing glasses under sports frames, the RX insert keeps your vision correction seamless across the whole panoramic lens.
Customisable Prescriptions: Inserts can be tailored by opticians to match your specific needs, including complex prescriptions and astigmatism.
Swappable Lenses: Change out the outer lens for different conditions without removing the insert ideal for athletes who train year-round.
Lightweight & Stable: Designed not to rattle or move, even on rough terrain.
For UK riders, Extreme Eyewear is an authorised stockist offering professional fitting of Kelion sunglasses with RX inserts making sure your prescription is perfectly matched for performance.
What Riders Say
Cyclists who’ve switched to the Kelion consistently praise:
Unmatched Clarity: Especially when using the ImpactX® 2 Laser Purple lenses in shifting light conditions.
Fog Resistance: The airflow design keeps lenses clear even during climbs and interval training.
Comfort on Long Rides: Adjustable nosepads and featherweight frames mean you forget they’re on.
Prescription Integration: Riders love not having to wear regular glasses under their cycling eyewear everything feels natural, streamlined, and pro-level.
One review summed it up perfectly: “The Kelion with RX insert finally gave me the freedom to ride without compromise no fogging, no slipping glasses, just pure focus on the road ahead.”
Warranty & Authenticity
When you buy the Rudy Project Kelion, you’re investing in world-class Italian cycling eyewear backed by a trusted warranty.
2-Year Manufacturer’s Warranty: Covers defects in materials and workmanship.
Crash Replacement Programme: Rudy Project offers lens replacement options in case of accidental damage.
Authorised Retailers: Buying from trusted outlets like Extreme
Eyewear UK guarantees genuine parts, prescription insert support, and aftercare.
Spare Parts & Lenses: Frames, nosepads, temples, and lenses are replaceable extending the life of your sunglasses.
Why Choose the Rudy Project Kelion?
If you’re a cyclist who wears prescription lenses, the Kelion is the ultimate solution. Unlike generic clip-ons or wearing regular glasses under your helmet, the RX insert system delivers:
Professional-grade vision correction without compromise.
Aerodynamic performance eyewear trusted by pro teams worldwide.
Adaptability for every condition from dawn commutes to alpine
descents.
Durability and comfort for years of hard riding.
With its blend of Italian design, innovative technology, and prescription-ready versatility, the Rudy Project Kelion stands at the pinnacle of modern cycling eyewear.
Lead Times
Oakley Prescription Sunglasses – 2 to 3 weeks *
Ray-Ban Prescription Sunglasses – 2 to 3 weeks *
Bolle Prescription sunglasses – 2 to 3 weeks
Rudy Project Prescription sunglasses – 3 to 4 weeks
Uvex Prescription sunglasses – 2 to 3 weeks
Serengeti Prescription Sunglasses – 2 to 3 weeks
Oakley Prescription Sunglasses fitted with Digital custom lenses – 3 to 4 weeks
* If you have a required by date in mind during checkout please leave a note in the ‘comments’ box to advise your date and we will pass it onto the manufacturer. If your date is before the lead times we can’t promise the sunglasses will be delivered in this timescale however the brands will aim to hit your dates.
Prescription Help Understanding your prescription
Your prescription is split into three sections, Sphere, Cylinder and Axis. You will most commonly see this written as, Sph, Cyl and Axis.
There are simple rules for each part of the prescription
Sphere – Is always a number in 0.25 jumps (i.e. 0.25, 0.50, 0.75, 1.00, 1.25). This can either be written in minus or plus (- or +).
IMPORTANT: You must select the correct symbol when ordering (minus or plus, – or +) as selecting the wrong sign will create the completely wrong prescription required to correct your vision.
Cyl – Is always a number in 0.25 jumps (i.e. 0.25, 0.50, 0.75, 1.00, 1.25). This can either be written in minus or plus.
IMPORTANT: You must select the correct symbol when ordering (minus or plus, – or +) as selecting the wrong sign will create the completely wrong prescription required to correct your vision.
Axis – Is a number between 0 and 180, it can also be written to point five (0.5) of a degree. This simply happens if the optometrist can’t decide wether you prefer for example 79 or 80 so they simply write your axis as 79.5. In this case lets get your glasses as accurate as possible so please provide us with the 79.5.
The in instances when a prescription doesn’t have a value for the Cyl section please leave the Axis blank (or some opticians write this as 0.00), the Axis is indicating what degree the Cyl figure sits at so if there is no Cyl there is no Axis required.
Other symbols which are often seen written in a glasses prescription
Infinity Symbol ∞ – this is another way of writing zero (no prescription) so simply select 0.00 into the corresponding section for either sphere or cyl.
Plano – this is another way of writing zero (no prescription) so simply select 0.00 into the corresponding section for either sphere or cyl.
Varifocals - What is the Add (Addition) part of my prescription?
You typically start to get the add part to a prescription when you hit 40+ and it is a measure of the amount of magnification you require to read.
The add is a plus (+) power which identifies how much extra addition (magnification) a glasses wearer requires (on top of their distance prescription) in order to read comfortably at close up distances, such as reading.
NOTE: Sometimes an optician will write your prescription for reading as a full prescription rather than simply supplying your reading add.
Example:
Distance
Right: -2.50 / -0.50 x 180
Left: -2.00 / -0.75 x 175
Near
Right: -1.00 / -0.50 x 180
Left: -0.50 / -0.75 x 175
Reading Add = +1.50
In this case to get your reading add take your distance Prescription Sphere off your reading Shere. The difference between the two figures is your reading add used for Varifocals.
Pupil DistanceLet our Dispensing Optician Measure your Pupil Distance accurately
For the Pupil Distance options on the ordering pages select 'Let Extreme eyewear measure your PD' and we'll post you our specially designed glasses.
(Note: On some projects the PD option will state 'send ruler' this option will still get you the new PD Measuring Glasses)
All you have to do is take a simple photo of you wearing our glasses and emailing your photo to us.
Our Dispensing Optician will then accurately take your mono pupil distances. Our PD glasses allows our dispensing opticians to gain all the details they need to set up single vision and varifocal sunglasses / eyewear accurately.
Let us supply you with perfect vision.
This service is free for all prescription eyewear orders.
What is your PD?
Your Pupil Distance is the measurement between the centre of your right and left pupils in mm.
How can you find out your Pupil Distance?
You may be lucky enough to have been given this by your optician
You can select to have our Pupil Distance measuring glasses posted to you. These will leave us on the same day you place an order 1st class post.
Why have we gone to the trouble of supplying PD Glasses?
Prescription glasses and sunglasses always work better when the centre of the optical lens is over your pupil. Not having this set up correctly can cause head aches and limit how well the glasses will work.
Varifocal Wearers
If you don't know your Mono Pupil Distances (this is two separate measurements for your right and left pupils) we strongly advise you select to have our PD Glasses posted to you. Varifocals with out mono pupil distances will not work correctly.
If you know your Mono Pupil Distances during the checkout there is a comment box, please write your right and left mono pupil distances in this comment box.
Examples
A pupil distance of 65 may have mono pupil distances of
Right 33
Left 32
Your total PD is still the same (65) But by using the separate mono pupil distances the centre of the varifocals will be positioned over your pupils making sure the clear corridor leading to your reading is in the correct position.
How do I receive PD Measuring Glasses?
In the PD options select ‘Let Extreme eyewear measure your PD’. The Digital ruler will be posted out on the same day as your order is placed to your shipping address supplied. (If your order comes in after 4.00pm the ruler will leave us the next day).
Abroad Orders
We will post the PD Measuring Glasses abroad but please allow a little more time to complete your order. The PD measuring glasses may take up to a week to get to abroad addresses.
Reviews
I messed up and they still put it right...
Great service from the guys at extreme Eyewear. I goofed up and ordered the wrong thing. What I wanted was something they did not even sell. But, this was no problem. They ordered in what I wanted and sent it out with a postage bag to send back the wrong product. I messed up and they still put it right. Highly recommended.
Marcus Miller - Google Review
Nothing is too much trouble...
Excellent service. Got a pair of Oakley prescription glasses with Oakley varifocal lenses which I couldn't get from any local opticians . Struggled to get Oakley lenses anywhere to be honest. Two week delivery time turned out to be less than a week and included May bank holiday. Nothing is too much trouble for these guys. Glasses are spot on and you won't find the bloke next to you wearing the same!
