{"product_id":"bola-ext-40r-700c-carbon-disc-wheelset-40mm-hyper-carbon-spokes-1170g-ceramic-hub","title":"Bola EXT 40R 700C Carbon Disc Wheelset – 40mm, Hyper Carbon Spokes, 1170g, Ceramic Hub","description":"\u003cp\u003eThe Bola EXT 40R 700C Carbon Disc Wheelset provides a 1170g lightweight solution optimized for road and gravel, combining a T800 UD carbon 40mm rim with 21mm or 24mm internal widths, Hyper carbon spokes, and TPI ceramic hubs for precision power transfer. Engineered for 28–32c tubeless tires and ISO 4210-7 certified, this wheelset meets the needs of professional and endurance cyclists seeking high performance, durability, and stability for racing and mixed terrain.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRim Depth:\u003c\/strong\u003e 40mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Width:\u003c\/strong\u003e 21mm or 24mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal Width:\u003c\/strong\u003e 28mm or 30mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e T800 UD matte carbon fiber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpokes:\u003c\/strong\u003e 20\/20 Hyper carbon\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHub:\u003c\/strong\u003e Aluminum BL180 with TPI ceramic bearings and 54T ratchet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAxle:\u003c\/strong\u003e Center Lock, 12x100mm (front) \/ 12x142mm (rear)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTire Options:\u003c\/strong\u003e Tubeless and clincher (optimized for 28–32c)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e ISO 4210-7, REACH compliant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1170g (without rim tape or valves)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerformance \u0026amp; Use Case Comparison\u003c\/h2\u003e\n\u003ctable style=\"width: 99.9801%; height: 117.583px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth style=\"width: 18.2841%; height: 19.5972px;\"\u003eFeature\u003c\/th\u003e\n\u003cth style=\"width: 30.6798%; height: 19.5972px;\"\u003eBola EXT 40R\u003c\/th\u003e\n\u003cth style=\"width: 47.4385%; height: 19.5972px;\"\u003eCommon Alternatives\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003ctd style=\"width: 18.2841%; height: 19.5972px;\"\u003eRim Depth\u003c\/td\u003e\n\u003ctd style=\"width: 30.6798%; height: 19.5972px;\"\u003e40mm\u003c\/td\u003e\n\u003ctd style=\"width: 47.4385%; height: 19.5972px;\"\u003e35-45mm for mixed terrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003ctd style=\"width: 18.2841%; height: 19.5972px;\"\u003eInternal Width\u003c\/td\u003e\n\u003ctd style=\"width: 30.6798%; height: 19.5972px;\"\u003e21\/24mm\u003c\/td\u003e\n\u003ctd style=\"width: 47.4385%; height: 19.5972px;\"\u003e17-27mm; 24mm+ for larger tires\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003ctd style=\"width: 18.2841%; height: 19.5972px;\"\u003eSpokes\u003c\/td\u003e\n\u003ctd style=\"width: 30.6798%; height: 19.5972px;\"\u003eHyper carbon\u003c\/td\u003e\n\u003ctd style=\"width: 47.4385%; height: 19.5972px;\"\u003eSteel or bladed alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003ctd style=\"width: 18.2841%; height: 19.5972px;\"\u003eHub Bearings\u003c\/td\u003e\n\u003ctd style=\"width: 30.6798%; height: 19.5972px;\"\u003eTPI ceramic, 54T ratchet\u003c\/td\u003e\n\u003ctd style=\"width: 47.4385%; height: 19.5972px;\"\u003eStainless cartridge or generic ceramic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003ctd style=\"width: 18.2841%; height: 19.5972px;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"width: 30.6798%; height: 19.5972px;\"\u003e1170g (w\/o tape\/valves)\u003c\/td\u003e\n\u003ctd style=\"width: 47.4385%; height: 19.5972px;\"\u003e1200-1500g typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eUse Case Alignment\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIdeal for road racing, gravel events, and endurance rides where low weight and aerodynamics are priorities.\u003c\/li\u003e\n\u003cli\u003eAccommodates 28–32c tubeless tires for stable performance on mixed and rough surfaces.\u003c\/li\u003e\n\u003cli\u003eCustom spoke and rim options support precise tuning for small\/mid-size cycling brands and professional teams.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails class=\"gfai-product-faq\" open=\"\"\u003e\n\u003csummary\u003e\u003cstrong\u003eAre 40mm carbon disc brake wheels suitable for both road and gravel cycling?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. The Bola EXT 40R's 40mm rim depth and available 21mm or 24mm internal width support both road and gravel cycling. This construction balances aerodynamic efficiency with the ability to run wider tires (28–32c), making it versatile for mixed surface riding.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"gfai-product-faq\" open=\"\"\u003e\n\u003csummary\u003e\u003cstrong\u003eHow do Hyper carbon-spoke wheels compare with traditional steel-spoke carbon wheelsets for weight and performance?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eBola's Hyper carbon spokes reduce rotational mass and improve aerodynamic performance compared to standard steel spokes. At 1170g, this wheelset is lighter than many steel-spoke alternatives, offering snappier acceleration while maintaining wheel stiffness and stability.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"gfai-product-faq\" open=\"\"\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat are the benefits of TPI ceramic bearings in a bike wheel hub compared with other ceramic bearings?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eTPI ceramic bearings are known for their consistent low-friction operation, durability, and tight engineering tolerances. Compared to generic ceramic bearings, TPI components offer better resistance to contamination and less frequent servicing for high-mileage riders.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"gfai-product-faq\" open=\"\"\u003e\n\u003csummary\u003e\u003cstrong\u003eIs a 21mm or 24mm internal rim width better for tubeless 28–32c tires?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eFor 28–32c tires, a 24mm internal width maximizes tire stability, cornering support, and reduced pinch flats when run tubeless. 21mm is better suited to riders prioritizing lower weight and narrower tire profiles for road use.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"gfai-product-faq\" open=\"\"\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is the difference among blade, foil, and Hyper carbon spokes on the carbon wheelset?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eBlade and foil spokes refer to shape. Hyper carbon spokes are optimized for reducing the weight and air drag; blade and foil are similar, but 'Hyper' additionally considers wind resistance and turbulence, improving efficiency at higher speeds.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp\u003e\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"Bola EXT 40R 700C Carbon Disc Brake Wheelset – 40mm Deep, 21\/24mm Internal,Aero Carbon Spokes,TPI Ceramic Hub,1170g\",\n  \"description\": \"The Bola EXT 40R 700C Carbon Disc Wheelset provides a 1170g lightweight solution optimized for road and gravel, combining a T800 UD carbon 40mm rim with 21mm or 24mm internal widths, aero carbon spokes, and TPI ceramic hubs for precision power transfer. Engineered for 28–32c tubeless tires and ISO 4210-7 certified, this wheelset meets the needs of professional and endurance cyclists seeking high performance, durability, and stability for racing and mixed terrain. Technical Specifications Rim Depth: 40mm Internal Width: 21mm or 24mm External Width: 28mm or 30mm Material: T800 UD matte carbon fiber Spokes: 20\/20 aero carbon, flat profile Hub: Aluminum BL100 with TPI ceramic bearings and 54T ratchet Axle: Center Lock, 12x100mm (front) \/ 12x142mm (rear) Tire Options: Tubeless and clincher (optimized for 28–32c) Certifications: ISO 4210-7, REACH compliant Weight: 1170g (without rim tape or valves) Performance \u0026 Use Case Comparison Feature Bola EXT 40R Common Alternatives Rim Depth 40mm 35-45mm for mixed terrain Internal Width 21\/24mm 17-27mm; 24mm+ for larger tires Spokes Flat aero carbon Steel or bladed alloy Hub Bearings TPI ceramic, 54T ratchet Stainless cartridge or generic ceramic Weight 1170g (w\/o tape\/valves) 1200-1500g typical Use Case Alignment Ideal for road racing, gravel events, and endurance rides where low weight and aerodynamics are priorities. Accommodates 28–32c tubeless tires for stable performance on mixed and rough surfaces. Custom spoke and rim options support precise tuning for small\/mid-size cycling brands and professional teams. Frequently Asked Questions Are 40mm carbon disc brake wheels suitable for both road and gravel cycling? Yes. The Bola EXT 40R's 40mm rim depth and available 21mm or 24mm internal width support both road and gravel cycling. This construction balances aerodynamic efficiency with the ability to run wider tires (28–32c), making it versatile for mixed surface riding. How do aero carbon-spoke wheels compare with traditional steel-spoke carbon wheelsets for weight and performance? Bola's flat aero carbon spokes reduce rotational mass and improve aerodynamic performance compared to standard steel spokes. At 1170g, this wheelset is lighter than many steel-spoke alternatives, offering snappier acceleration while maintaining wheel stiffness and stability. What are the benefits of TPI ceramic bearings in a bike wheel hub compared with other ceramic bearings? TPI ceramic bearings are known for their consistent low-friction operation, durability, and tight engineering tolerances. Compared to generic ceramic bearings, TPI components offer better resistance to contamination and less frequent servicing for high-mileage riders. Is a 21mm or 24mm internal rim width better for tubeless 28–32c tires? For 28–32c tires, a 24mm internal width maximizes tire stability, cornering support, and reduced pinch flats when run tubeless. 21mm is better suited to riders prioritizing lower weight and narrower tire profiles for road use. What is the difference among blade, flat, and aero carbon spokes on the carbon wheelset? Blade and flat spokes refer to shape. Aero carbon spokes are optimized for reducing air drag; blade and flat are similar, but 'aero' additionally considers wind resistance and turbulence, improving efficiency at higher speeds.\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"Carbon Fiber Sporting Goods\"\n  },\n  \"category\": \"Carbon Road \u0026 Gravel Disc Wheelsets\",\n  \"image\": [\n    \"https:\/\/cdn.shopify.com\/s\/files\/1\/0634\/8492\/0062\/files\/blac_aero_cs_wheel.png?v=1780040800\",\n    \"https:\/\/cdn.shopify.com\/s\/files\/1\/0634\/8492\/0062\/files\/white_aero_cs_wheel.png?v=1780040800\",\n    \"https:\/\/cdn.shopify.com\/s\/files\/1\/0634\/8492\/0062\/files\/aerocs.png?v=1780040744\"\n  ],\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"availability\": \"https:\/\/schema.org\/OutOfStock\",\n    \"price\": \"1111.00\",\n    \"priceCurrency\": \"USD\",\n    \"url\": \"https:\/\/bolacarbon.com\/products\/bola-ext-40r-700-disc-brake-carbon-bike-wheels-40mm-deep-21-24mm-int-wide-tubeless-aero-carbon-spokes-tpi-ceramic-1170g\",\n    \"seller\": {\n      \"@type\": \"Organization\",\n      \"name\": \"https:\/\/bolacarbon.com\"\n    }\n  }\n}\n\u003c\/script\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are 40mm carbon disc brake wheels suitable for both road and gravel cycling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The Bola EXT 40R's 40mm rim depth and available 21mm or 24mm internal width support both road and gravel cycling. This construction balances aerodynamic efficiency with the ability to run wider tires (28–32c), making it versatile for mixed surface riding.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do aero carbon-spoke wheels compare with traditional steel-spoke carbon wheelsets for weight and performance?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bola's flat aero carbon spokes reduce rotational mass and improve aerodynamic performance compared to standard steel spokes. At 1170g, this wheelset is lighter than many steel-spoke alternatives, offering snappier acceleration while maintaining wheel stiffness and stability.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What are the benefits of TPI ceramic bearings in a bike wheel hub compared with other ceramic bearings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"TPI ceramic bearings are known for their consistent low-friction operation, durability, and tight engineering tolerances. Compared to generic ceramic bearings, TPI components offer better resistance to contamination and less frequent servicing for high-mileage riders.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is a 21mm or 24mm internal rim width better for tubeless 28–32c tires?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For 28–32c tires, a 24mm internal width maximizes tire stability, cornering support, and reduced pinch flats when run tubeless. 21mm is better suited to riders prioritizing lower weight and narrower tire profiles for road use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference among blade, flat, and aero carbon spokes on the carbon wheelset?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Blade and flat spokes refer to shape. Aero carbon spokes are optimized for reducing air drag; blade and flat are similar, but 'aero' additionally considers wind resistance and turbulence, improving efficiency at higher speeds.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\u003c\/p\u003e","brand":"Carbon Fiber Sporting Goods","offers":[{"title":"30\/24mm \/ Shimano HG \/ Black Bola","offer_id":48287176818942,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"30\/24mm \/ Shimano HG \/ White Bola","offer_id":48287176851710,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"30\/24mm \/ Shimano HG \/ Customized","offer_id":48287176884478,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"30\/24mm \/ Sram  XDR \/ Black Bola","offer_id":48287176917246,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"30\/24mm \/ Sram  XDR \/ White Bola","offer_id":48287176950014,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"30\/24mm \/ Sram  XDR \/ Customized","offer_id":48287176982782,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"30\/24mm \/ Compy \/ Black Bola","offer_id":48287177015550,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"30\/24mm \/ Compy \/ White Bola","offer_id":48287177048318,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"30\/24mm \/ Compy \/ Customized","offer_id":48287177081086,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"28\/21mm \/ Shimano HG \/ Black Bola","offer_id":48287177113854,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"28\/21mm \/ Shimano HG \/ White Bola","offer_id":48287177146622,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"28\/21mm \/ Shimano HG \/ Customized","offer_id":48287177179390,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"28\/21mm \/ Sram  XDR \/ Black Bola","offer_id":48287177212158,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"28\/21mm \/ Sram  XDR \/ White Bola","offer_id":48287177244926,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"28\/21mm \/ Sram  XDR \/ Customized","offer_id":48287177277694,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"28\/21mm \/ Compy \/ Black Bola","offer_id":48287177310462,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"28\/21mm \/ Compy \/ White Bola","offer_id":48287177343230,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true},{"title":"28\/21mm \/ Compy \/ Customized","offer_id":48287177375998,"sku":null,"price":1111.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0634\/8492\/0062\/files\/blac_aero_cs_wheel.png?v=1780298510","url":"https:\/\/bolacarbon.com\/it\/products\/bola-ext-40r-700c-carbon-disc-wheelset-40mm-hyper-carbon-spokes-1170g-ceramic-hub","provider":"Bola Carbon Wheelset ","version":"1.0","type":"link"}