Cannondale SystemSix HiMod Ultegra Di2 2021 - Road Bike
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The fastest UCI-legal bike in the world. More speed with less effort. Simple as that.
- Speed of Six
SystemSix is based on a six-part system - frame, fork, seatpost, bar, stem and wheels - designed together holistically to minimize drag, enhance comfort and optimize stiffness for maximum speed.
- Cannondale KNØT SystemBar
Provides the low drag and sleek look of a one-piece system, with the fit and Interchangeability benefits of a two-piece bar and stem.
- HollowGram 64 KNØT Wheels
One of the fastest wheelsets ever created. Ultra-wide, disc-only design offers incredibly low drag at a wide range of yaw angles, even with larger volume tires.
- HollowGram 60 KNØT Seatpost
An vital part of the system, the KNØT seatpost is designed specifically to reduce drag in the high speed airflow that is accelerated between the rider’s legs.
- Customized Airfoils
Every section of the frame, fork and seatpost features it own customized truncated airfoil shape, designed to reduce drag across the effective yaw range.
- Hidden Cable Routing
Unique design routes brake lines and cables through an opening in the front of the headtube for minimal drag and headache-free serviceability.
An integrated wheel sensor delivers hyper accurate speed, route and distance info, registers your bike, reminds you of needed service and more, all through the free Cannondale App.
- Speed Release Equipped
The Speed Release thru-axles allow faster, easier wheel changes and are compatible with most standard thru-axle wheelsets.
- BallisTec Hi-MOD Carbon
Cannondale's premium high-strength, high-stiffness carbon construction. A sophisticated blend of high-strength and high-stiffness fibers yields a frame that’s extremely light, lively and durable.
Occasionally, without notice, manufacturers change product design and/or specifications.
|Frame:||Hi-MOD Carbon, integrated cable routing w/ Switchplate, SAVE, PF30a, flat mount disc, 12x142 Speed Release thru-axle|
|Fork:||BallisTec Hi-MOD Carbon, 1-1/8" - 1-1/4" steerer, 12x100mm Speed Release thru-axle, flat mount disc, 55mm offset (47-51cm) 45mm offset (54-62cm)|
|Headset:||Integrated, 1-1/8" - 1-1/6|
|Stem:||HollowGram KNØT, Alloy w/ cable cover, -17°|
|Bars:||HollowGram KNØT SystemBar, Carbon, 8 deg. pitch adjust|
|Front Brake:||Shimano Ultegra Di2 hydraulic disc, 160mm RT800 rotors|
|Rear Brake:||Shimano Ultegra Di2 hydraulic disc, 140mm RT800 rotors|
|Brake Lever:||Shimano Ultegra Di2|
|Front Mech:||Shimano Ultegra Di2, braze-on|
|Rear Mech:||Shimano Ultegra Di2|
|Shifters:||Shimano Ultegra Di2, 11-speed|
|Rims:||HollowGram 64 KNØT, Carbon, 20h front, 24h rear, 64mm deep, 21mm IW, tubeless ready|
|Front Hub:||HollowGram KNØT, sealed bearing 12x100 centerlock|
|Rear Hub:||HollowGram KNØT, 12x142 centerlock w/ DT Swiss 240 internals|
|Spokes:||HollowGram, 2.0/1.8/2.0, straight-pull|
|Front Tyre:||Vittoria Rubino Pro Speed, 700 x 25c|
|Rear Tyre:||Vittoria Rubino Pro Speed, 700 x 25c|
|Seat Post:||HollowGram 60 KNØT Carbon, 330mm|
|Saddle:||Prologo Dimension NDR, Tirox rails|
|Chainset:||HollowGram, BB30a, OPI SpideRing, 52/36|
|Bottom Bracket:||Cannondale Alloy PressFit30|
|Chain:||Shimano HG701, 11-speed|
|Cassette:||Shimano Ultegra, 11-30, 11-speed|
Systemsix Sizing & Geometry
Cannondale SystemSix 2021 Size Chart
|Size||Height (cm)||Height (Inches)|
|51||165 - 175||5'5 - 5'9|
|54||170 - 180||5'7 - 5'11|
|56||177 - 187||5'10 - 6'2|
|58||182 - 193||6'0 - 6'4|
|60||187 - 198||6'2 - 6'6|
Cannondale SystemSix 2021 Geometry
|Seat Tube Length (cm)||38.5||43.3||48.2||53.0||55.3||57.7||60.0|
|Top Tube Horizontal (cm)||51.4||52.9||54.4||56||57.6||59.2||60.9|
|Head Tube Angle||71.2°||71.2°||73.0°||73.0°||73.0°||72.9°||72.9°|
|Seat Tube Angle||75.1°||74.7°||74.3°||73.9°||73.5°||73.1°||72.7°|
|Seat Tube Angle Effective||74.5°||74.1°||73.7°||73.3°||72.9°||72.5°||72.1°|
|Head Tube Length (cm)||8.8||11.4||12.8||14.9||17.2||19.3||21.4|
|Front Center (cm)||58.2||59.5||58.1||59.3||60.5||61.7||62.9|
|Chain Stay Length (cm)||40.5||40.5||40.5||40.5||40.5||40.5||40.5|
|Bottom Bracket Drop (cm)||7.9||7.4||7.2||7.2||6.9||6.9||6.9|
|Bottom Bracket Height (cm)||26.1||26.6||26.9||26.9||27.1||27.1||27.1|
|Fork Rake (cm)||5.5||5.5||4.5||4.5||4.5||4.5||4.5|
What size frame do I need if I am between sizes? - read here
Please note, all size information is provided as a guide - if you're unsure or need any further assistance you can call us on 01792 799508 ... we're happy to help!
Road Bike Guide
How do I apply for finance?
Spend £99 or more at Tredz and you can spread the cost. Pay monthly over 6-48 months, interest free (dependent on repayment terms and amount).
1Fill your basket with everything you want from Tredz and go to the checkout.
2During checkout, select the finance option you want as your method of payment.
3You will be sent to our finance provider's secure server to complete your application.
4Finance providers PayPal & V12 will use the information provided to make a decision and complete checkout if you are approved.Read more about buying on finance
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Choose your deposit.
Choose your term.
Lowest £0 deposit / 0% interest
for 48 months
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Delivery & Guarantee
UK Delivery Information
International Deliveries – Temporarily Suspended 11/11/20
Note: We are still offering deliveries to the Isle of Man, Scottish Highlands, Scottish Islands, Channel Islands, Isle of Wight, Jersey and Guernsey. We are no longer delivering to Northern Ireland.
Courier Delivery update: Due to the COVID19 situation, we are currently experiencing some delays with deliveries. Our couriers are working around the clock to get your order to you as soon as possible but there is a potential delay of up to 48 hours . Please check your tracking on track your order here.
Please note on the TNT tracking app it may show your delivery status as ‘Collecting’ (as per image below). This means your delivery has left our warehouse and is currently held at TNT main depot and there could be up to a 48 hour delay.
Please keep checking the TNT tracking for further updates. On behalf of TNT we apologise for any delay and inconvenience this may cause.
We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE in the UK, regardless of the size and on all orders over £20.
Please note that bulky products and bikes shipped to outlying UK regions are excluded from free shipping.
Please note that Pre-Order dates can sometimes change due to updated stock information.
Click here for more UK and international delivery information.
Returns & Warranty
It's easy to return a product with our 365 day, hassle free returns.
We will give you a full refund or exchange on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).
Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.
If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.
For more information please visit our Returns & Warranty page.
What's In The Box
What's In The Box
As cyclists ourselves, we know you will be keen to get out on your new bike as soon as possible. That's why we provide you with all the essential kit you need to get your shiny new bike rolling for the first time.
Most bikes don't come with pedals as standard so we include a set of basic pedals, free of charge with every bike we send out. We will also provide you with a pedal spanner to fit them and a 9-key trail tool, along with full instructions for setting your bike up out of the box. Each bike is sent out with a 16 point, quality control check sheet so you can be confident that your bike has been fully checked by our qualified mechanics.
- Basic setup instructions
- 16 point quality control checklist
- Free tredz multitool
- Free tred pedal spanner
- Free basic pedals
- Free drawstring kit bag
- Free bike insurance voucher
All these items are provided at no extra charge and are packed into a Tredz drawstring bag that doubles up as a handy backpack for carrying your ride essentials.
- Basic bike setup instructions
- Free ‘basic’ pedals
- Free Tredz pedal spanner
- Free Tredz 9-key trail tool
- Free Tredz drawstring bag
- Free 8 weeks insurance voucher
- 16 point, quality control check sheet
Read our bike setup guide.
- Tredz bikes are fully checked & tested by Cytech qualified mechanics
- 0% APR finance available on any basket over £99
- 365 day 'no hassle' returns
- Free UK delivery, on a date that suits you
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