Any electric bike that has been modified or "chipped" will result in automatic disqualification of liability for any error codes or damage to the electric system. If an error code occurs due to modifications made to the bike, which affects its performance or functionality, we will not be held responsible. All service costs will still be applicable. By booking a service for a modified electric bike, either through our website or in-store, you automatically agree to these terms and conditions.Any electric bike that has been modified or "chipped" will result in automatic disqualification of liability for any error codes or damage to the electric system. If an error code occurs due to modifications made to the bike, which affects its performance or functionality, we will not be held responsible. All service costs will still be applicable. By booking a service for a modified electric bike, either through our website or in-store, you automatically agree to these terms and conditions. #shopify-section-sections--20458360865110__section_custom_content_YQCAbX body {color: blue;}
Argon 18 Sum Shimano Ultegra Di2
The Argon 18 Sum is a lightweight aero road platform designed to be fast everywhere: climbing, rolling terrain, bunch rides and racing. It combines aerodynamic tube shaping, integrated cabling and sharp modern road geometry in a package that works as one fast do-it-all road bike. This version is supplied in the Shimano Ultegra Di2 configuration and is available in Smoked Nickel, British Racing Green. Images are supplied by Argon 18 and may be illustrative. Final specification can vary by region and assembly option.Images are supplied by Argon 18 and may be illustrative. Final specification can vary by region and assembly option.
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Key specificationKey specification
Argon 18 Sum Pro Shimano Ultegra Di2
FrameFrameThe Argon 18 Sum Pro is a top-tier race platform made to combine low weight, aero efficiency and sharp race handling. It is aimed at riders who want one fast road bike for climbing, fast rolling terrain, criteriums and bunch sprints. The frame uses Argon 18's Sum Pro chassis with integrated cabling, aero tube shaping, 3D fit system and clearance for up to 30C tyres, with measured clearance noted at 32mm.
This version is supplied in the Shimano Ultegra Di2 configuration and is available in Titanium / Racing Red or Crystal Black / Foil.SUM carbon frameSUM carbon frame
SUM Pro carbon race platform
Integrated cable routing
ForkFork
Aero/lightweight road geometrySUM specific carbon forkSUM specific carbon fork
Fits up to 30C tyres, with listed clearance up to 32mm
Available sizes: XXS 44-46, XS 47-50, S 51-53, M 54-56, L 57-59 and XL 60-62.
FrameGroupsetGroupset
Key specificationShimano Ultegra Di2 R8150Shimano Ultegra Di2 R8150
ForkWheelsetWheelsetSUM Pro carbon frame
Scope R4Scope R4
GroupsetTyresTyresSUM Pro specific carbon fork
Vittoria Corsa N.EXT TLR 28mmVittoria Corsa N.EXT TLR 28mm
CranksetBrakesBrakesShimano Ultegra Di2 R8150/R8170
Shimano Ultegra hydraulic disc brakesShimano Ultegra hydraulic disc brakes
CassetteCockpitCockpitShimano Ultegra R8100 52/36
Integrated aero road cockpit componentsIntegrated aero road cockpit components
WheelsetCable routingCable routingShimano Ultegra CS-R8100 11-30
Integrated cablesIntegrated cables
Frequently Asked Questions Frequently Asked Questions
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{"id":11315885834582,"title":"Argon 18 Sum Pro Shimano Ultegra Di2","handle":"argon-18-sum-pro-shimano-ultegra-di2","description":"\u003ch2\u003eArgon 18 Sum Pro Shimano Ultegra Di2\u003c\/h2\u003e\u003cp\u003eThe Argon 18 Sum Pro is a top-tier race platform made to combine low weight, aero efficiency and sharp race handling. It is aimed at riders who want one fast road bike for climbing, fast rolling terrain, criteriums and bunch sprints. The frame uses Argon 18's Sum Pro chassis with integrated cabling, aero tube shaping, 3D fit system and clearance for up to 30C tyres, with measured clearance noted at 32mm.\u003c\/p\u003e\u003cp\u003eThis version is supplied in the Shimano Ultegra Di2 configuration and is available in Titanium \/ Racing Red or Crystal Black \/ Foil.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSUM Pro carbon race platform\u003c\/li\u003e\n\u003cli\u003eIntegrated cable routing\u003c\/li\u003e\n\u003cli\u003eAero\/lightweight road geometry\u003c\/li\u003e\n\u003cli\u003eFits up to 30C tyres, with listed clearance up to 32mm\u003c\/li\u003e\n\u003cli\u003eAvailable sizes: XXS 44-46, XS 47-50, S 51-53, M 54-56, L 57-59 and XL 60-62.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKey specification\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eFrame\u003c\/th\u003e\n\u003ctd\u003eSUM Pro carbon frame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFork\u003c\/th\u003e\n\u003ctd\u003eSUM Pro specific carbon fork\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroupset\u003c\/th\u003e\n\u003ctd\u003eShimano Ultegra Di2 R8150\/R8170\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCrankset\u003c\/th\u003e\n\u003ctd\u003eShimano Ultegra R8100 52\/36\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCassette\u003c\/th\u003e\n\u003ctd\u003eShimano Ultegra CS-R8100 11-30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWheelset\u003c\/th\u003e\n\u003ctd\u003eDT Swiss ARC1400 Dicut Wheelset\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTyres\u003c\/th\u003e\n\u003ctd\u003eVittoria Corsa Pro TLR 28c\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrakes\u003c\/th\u003e\n\u003ctd\u003eShimano Ultegra Di2 R8170, RT-CL800 rotors F:160mm \/ R:140mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCockpit\u003c\/th\u003e\n\u003ctd\u003eVision Metron 5D ACR EVO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSaddle\u003c\/th\u003e\n\u003ctd\u003eRepente Quasar CR Carbon Rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeatpost\u003c\/th\u003e\n\u003ctd\u003eSUM specific, included with frameset\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCable routing\u003c\/th\u003e\n\u003ctd\u003eIntegrated cables\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cem\u003eImages are supplied by Argon 18 and may be illustrative. Final specification can vary by region and assembly option.\u003c\/em\u003e\u003c\/p\u003e","published_at":"2026-09-30T13:45:44+01:00","created_at":"2026-09-30T13:35:55+01:00","vendor":"Argon 18","type":"Road bike","tags":["Aero Road Bike","Argon 18","Electronic Shifting","IW","Race Bike","Road Bike","Shimano Ultegra Di2","spo-cs-disabled","spo-default","spo-disabled","spo-notify-me-disabled","Sum Pro"],"price":577500,"price_min":577500,"price_max":577500,"available":false,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":55540990738774,"title":"Titanium \/ Racing Red \/ XXS 44-46","option1":"Titanium \/ Racing Red","option2":"XXS 44-46","option3":null,"sku":"SUMP.XXS.378A.2D.1","requires_shipping":true,"taxable":true,"featured_image":null,"available":false,"name":"Argon 18 Sum Pro Shimano Ultegra Di2 - Titanium \/ Racing Red \/ XXS 44-46","public_title":"Titanium \/ Racing Red \/ XXS 44-46","options":["Titanium \/ Racing Red","XXS 44-46"],"price":577500,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":55540990771542,"title":"Titanium \/ Racing Red \/ XS 47-50","option1":"Titanium \/ Racing Red","option2":"XS 47-50","option3":null,"sku":"SUMP.XS.378A.2D.1","requires_shipping":true,"taxable":true,"featured_image":null,"available":false,"name":"Argon 18 Sum Pro Shimano Ultegra Di2 - Titanium \/ Racing Red \/ XS 47-50","public_title":"Titanium \/ Racing Red \/ XS 47-50","options":["Titanium \/ Racing Red","XS 47-50"],"price":577500,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":nullOur warranty provides a guarantee against manufacturer defects.Our warranty provides a guarantee against manufacturer defects.
The guarantee covers any manufacturing, design, or material defect. Please notify us within 2 months of noticing any defects.Di2 - Titanium \/ Racing Red \/ M 54-56","public_title":"Titanium \/ Racing Red \/ M 54-56","options":["Titanium \/ Racing Red","M 54-56"],"price":577500,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":55540990869846,"title":"Titanium \/ Racing Red \/ L 57-59","option1":"Titanium \/ Racing Red","option2":"L 57-59","option3":null,"sku":"SUMP.L.378A.2D.1","requires_shipping":true,"taxable":true,"featured_image":null,"available":false,"name":"Argon 18 Sum Pro Shimano Ultegra Di2 - Titanium \/ Racing Red \/ L 57-59","public_title":"Titanium \/ Racing Red \/ L 57-59","options":["Titanium \/ Racing Red","L 57-59"],"price":577500,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":55540990902614,"title":"Titanium \/ RacThe guarantee covers any manufacturing, design, or material defect. Please notify us within 2 months of noticing any defects.
It does not cover blows, improper use, or other issues that are not attributable to a manufacturer defects.":577500,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":55540990968150,"title":"Crystal Black \/ Foil \/ XS 47-50","option1":"Crystal Black \/ Foil","option2":"XS 47-50","option3":null,"sku":"SUMP.XS.378B.2D.1","requires_shipping":true,"taxable":true,"featured_image":null,"available":false,"name":"Argon 18 Sum Pro Shimano Ultegra Di2 - Crystal Black \/ Foil \/ XS 47-50","public_title":"Crystal Black \/ Foil \/ XS 47-50","options":["Crystal Black \/ Foil","XS 47-50"],"price":577500,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":55540991000918,"title":"Crystal Black \/ Foil \/ S 51-53","option1":"Crystal Black \/ Foil","option2":"S 51-53","option3":null,"sku":"SUMP.S.378B.2D.1","requires_shipping":true,"taxabIt does not cover blows, improper use, or other issues that are not attributable to a manufacturer defects.
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Final specification can vary by region and assembly option.","sku": "SUMP.XXS.378B.2D.1","brand": { "@type": "Thing", "name": "Argon 18" },"offers": [{ "@type" : "Offer","sku": "SUMP.XXS.378A.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540990738774" }, { "@type" : "Offer","sku": "SUMP.XS.378A.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540990771542" }, { "@type" : "Offer","sku": "SUMP.S.378A.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540990804310" }, { "@type" : "Offer","sku": "SUMP.M.378A.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540990837078" }, { "@type" : "Offer","sku": "SUMP.L.378A.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540990869846" }, { "@type" : "Offer","sku": "SUMP.XL.378A.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540990902614" }, { "@type" : "Offer","sku": "SUMP.XXS.378B.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540990935382" }, { "@type" : "Offer","sku": "SUMP.XS.378B.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540990968150" }, { "@type" : "Offer","sku": "SUMP.S.378B.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540991000918" }, { "@type" : "Offer","sku": "SUMP.M.378B.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540991033686" }, { "@type" : "Offer","sku": "SUMP.L.378B.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540991066454" }, { "@type" : "Offer","sku": "SUMP.XL.378B.2D.1","availability" : "http://schema.org/OutOfStock", "price" : 5775.0, "priceCurrency" : "GBP", "url" : "https:\/\/substancecycles.co.uk\/products\/argon-18-sum-pro-shimano-ultegra-di2?variant=55540991099222" } ] }#Accordions--template--20458361553238__section_accordions_GQJ4ft { --PT: 60px; --PB: 60px; --border-opacity: 0; --MB: 10px;--bg-padded-line: var(--bg);}#Accordions--template--20458361553238__section_accordions_GQJ4ft .accordion__item { --bg: #fafafa; }
Yes, we offer full and partial refunds. Yes, we offer full and partial refunds.
Please enquire for more information about our Refund policy.#Divider--template--20458361553238__section_divider_zmDVyw { padding-top: 50px; padding-bottom: 50px; }Please enquire for more information about our Refund policy. -
Frequently Asked Questions
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