2025 FX Sport SL 4 is no longer available.
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Trek FX Sport SL 4
The 2025 FX Sport SL 4 XS MATTE ONYX CARBON is available at the following locations.
The item will be transferred to the location you choose during checkout.
If the item is not currently available to view at your desired location, please call your nearest store to arrange for it to be transferred.
FX Sport 4 is a carbon fibre fitness bike for riders who want the speed of a lightweight road bike with the comfort and control of a flat handlebar. The 1x drivetrain simplifies shifting without sacrificing gear range, making this high-performance bike perfect for everything from solo workouts to speedy group rides.
You're ready to log big miles, and you prefer the feel of a flat handlebar to the drop bars that come stock on most road bikes. You prioritise comfort and performance equally, and want the simplicity that a 1x drivetrain provides.
A lightweight 400 Series OCLV Carbon frame and fork, a Shimano CUES 10-speed drivetrain with a wide-range cassette, Shimano hydraulic disc brakes for all-weather stopping power, a lightweight tubeless ready wheel set, wide, fast-rolling Bontrager GR1 Expert gravel tyres and a vibration-absorbing handlebar and ergonomic grips.
Fast, capable, comfortable. The FX Sport 4 has a road-smoothing carbon frame and quality parts that will hold up over serious miles, including the simpler-shifting 1x drivetrain.
- The 1x drivetrain delivers a wide range of gearing with the simplicity of a single shifter
- You get the superior ride quality of carbon without the bank-breaking price
- On your left! This fitness bike is more than capable of taking on speedy group road rides
- It's easy to accessorise with mudguards, lights and more!
Make it your own
Customise your bike with fenders, racks, bottle cages and more to make it your own.
1x drive train
A 1x drivetrain means more versatility, simpler shifting and fewer things to go wrong. You still have a wide range of gears, but with lighter and more intuitive shifting. Everything you need and nothing more.
Just-right geometry
The all-new FX Sport has slightly less reach and slightly more stack than previous models for a more comfortable yet active and fast riding position.
400 Series OCLV
Ultra high performance, within reach. The areal weight range and modulus mix of 400 Series OCLV provides an exhilarating sense of acceleration and confident handling.
Shimano CUES
Inspired by rider demand for trouble-free drivetrain longevity and performance, Shimano CUES offers a new foundation for versatility and durability across a range of both electric and standard bikes. CUES features Shimano's new LINKGLIDE drivetrain technology for significantly increased life on wear items like chain, cassette and chainrings.
Upgrade your pedals and love your bike more
Pedals are two of the five touchpoints that connect you with your bike, and even though this bike comes with a pair, upgrading to pedals that boost control and grip will greatly improve your ride. See the pedal guide and find the best pedals for your riding style. We recommend flat pedals for simple versatility.
Save up to 39% via Cycle to Work!
Purchasing through a Cycle to Work scheme enables you to pay for the bike via salary sacrifice and make a great saving.
Most bikes* and accessories we offer can be purchased through the scheme - You can also purchase accessories, clothing and upgrades for your bike too.
We accept vouchers from most providers, with a preference for Green Commute Initiative https://www.greencommuteinitiative.uk/ or GoGeta https://www.gogeta.com/
If your company haven’t signed up to a scheme, its super easy and with the provider Green Commute Initiative it doesn’t require the company to sign up - So less admin and paperwork for a busy admin/accounts team!
For a full list of providers we accept vouchers for see details here https://cooksoncycles.co.uk/cycle-to-work/ If you can’t see your provider on our list, just drop the store an email and we can double check.
*Depending on the cycle to work provider we may not be able to offer full discount on sale bikes or accessories due to commissions charged by the scheme.
0% Finance Options Available
Spread the cost of your purchase with 0% finance on all bikes, accessories, and parts. Simply choose Klarna at checkout to view your interest-free options, available for up to 36 months.
Prefer an alternative? We also offer Novuna Finance, with 0% APR available for up to 18 months, or interest-bearing loans over terms up to 48 months. Select Novuna at checkout to start your application.
Free UK Delivery On Bike Orders Over £1500 *
All our UK customers can select our FREE standard delivery option on any order over £35 (except exclusions). Learn more about Cookson Cycles Delivery options here.
Once processed, in store stock items will typically be dispatched within 48 hours.
If you have chosen our white glove delivery option dispatch times vary due to courier availability.
* excludes cycle to work purchases - Standard Delivery charge for all cycle to work purchases £35
Bike Build & Delivery
All our bikes are built in store and thoroughly inspected, before carefully packing back up for shipping. If you have selected our white glove delivery service, the bike will come to you ready to ride and the driver can help with some basic bike setup (Saddle height and suspension) at your doorstep. Please be aware if you haven’t selected our white glove delivery service the bike will require some assembly, which we recommend be carried out by an experienced mechanic. See assembly instructions here
Click & Collect
Click and collect is available on all purchases at checkout. Once your order is ready to collect, we will notify you via email or text.
| Frame | Size S, UNI, Carbon, Frame: CARBON |
| Wheel Size | Front 28 |
| Wheel Size | Rear 28 |
| Fork | Carbon, hidden fender mounts, flat mount disc, 5x100mm thru-skewer |
| Gears | DERAILLEUR, Shimano, 1 Gears |
| Tyres | BONTRAGER, |
| Pedals | BONTRAGER, |
| Wheels | Bontrager Paradigm, Tubeless Ready, 32-hole, 21 mm width, Presta valve Formula CL-51 alloy, 100x5 mm QR Formula CL-52 alloy, 135x5 mm QR |
| Shifters | SHIMANO, Shimano CUES U6000 w/optical gear display, 10-speed, |
| Front Brake | SH, Shimano hydraulic disc, MT201 lever, UR300 calliper // Shimano hydraulic disc, MT201 lever, UR300 caliper Shimano RT10, CenterLock, 160 mm Max brake rotor size, Disc brake with hydraulic actuation |
| Rear Brake | SH, Shimano hydraulic disc, MT201 lever, UR300 calliper // Shimano hydraulic disc, MT201 lever, UR300 caliper Shimano RT10, CenterLock, 160 mm Max brake rotor size, Disc brake with hydraulic actuation |
| Rear Derailleur | , |
| Crankset | Prowheel alloy, 42T narrow-wide ring, 175 mm length |
| Chain | SHIMANO, Shimano LG500, 9/10/11-speed |
| Handlebar | BONTRAGER, Bontrager Satellite Plus IsoZone, alloy, 31.8 mm, 15 mm rise, 600 mm width |
| Bartape / Grips | BONTRAGER |
| Seatpost | BONTRAGER |
| Saddle | BONTRAGER, Bontrager H1 |
| Front Light | UNKNOWN |
| Rear Light | UNKNOWN |
| Brand | Trek |
| Model Year | 2025 |
| Barcodes | 197216045786, 197216045793, 197216045809, 197216045816, 197216045823 |
| SKUs / Part Numbers | 5323707, 5323708, 5323709, 5323710, 5323711 |
Please note: Manufacturers can sometimes change the specification of the products from time to time.
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with a £ 0.00 deposit.
The total charge for credit is £ 0.00.
Choose an available finance option:
To apply, add the item to your basket and apply for finance on your entire basket.
Please note the above quotation is an indicative cost and actual monthly payments may vary by +/- 2p per month.
Credit subject to status and affordability. Terms & Conditions Apply. Cookson Cycles is a credit broker and is Authorised and Regulated by the Financial Conduct Authority. Credit is provided by Novuna Personal Finance, a trading style of Mitsubishi HC Capital UK PLC, authorised and regulated by the Financial Conduct Authority. Financial Services Register no. 704348. The register can be accessed through http://www.fca.org.uk.
24 Month Representative Example:
Purchase Price (incl. VAT) £750
Deposit £75
Loan Amount £675
Interest/Total Charge for Credit £109.32
Total Amount Repayable £859.32
Balance Payable £784.32
By 24 Monthly Repayments of £32.68
15.9% APR Representative
Bank rate of interest 8.1% PA fixed
Please note the above quotation is an indicative cost and actual monthly payments may vary.
For Buy Now Pay Later and Deferred Interest Bearing Credit: Interest is charged from day 1 of your agreement, but not charged on any repayments made during the deferral period. On expiry of the deferral period, interest accrued during the deferral period will be applied to your repayments.
Consumer credit services are only available to over 18s and subject to status.
This is for estimation purposes only. Actual Finance Application is Completed During Checkout.