[{"id":686518468978,"handle":"all-products","title":"All Products","updated_at":"2025-12-06T04:04:57-08:00","body_html":"","published_at":"2025-12-04T17:17:42-08:00","sort_order":"best-selling","template_suffix":"","disjunctive":false,"rules":[{"column":"variant_price","relation":"greater_than","condition":"0"},{"column":"variant_inventory","relation":"greater_than","condition":"0"}],"published_scope":"global"},{"id":686518567282,"handle":"best-sellers","title":"Best Sellers","updated_at":"2025-12-06T04:04:57-08:00","body_html":"","published_at":"2025-12-04T17:22:56-08:00","sort_order":"best-selling","template_suffix":"","disjunctive":false,"rules":[{"column":"variant_inventory","relation":"greater_than","condition":"0"},{"column":"tag","relation":"not_equals","condition":"service parts"}],"published_scope":"global"},{"id":621466943858,"handle":"e-spec-cranks","title":"E-MTB Cranks","updated_at":"2025-12-06T04:04:57-08:00","body_html":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003ePurpose-built for the demands of electric mountain bikes. Every e*spec crank is engineered for E-MTB strength and available in shorter lengths for improved pedal clearance on modern low-BB geometries. From the ultralight Helix Race Carbon to the value-driven Helix Core alloy, there's an option for every build and budget. Wide motor compatibility covers Bosch®, Brose®, TQ®, Fazua®, Avinox®, and Specialized® systems, with customizable offsets to dial in your Q-factor and ride feel. Self-extracting crank bolts make service simple. Molded impact boots keep you confident when pedal strikes happen.\u003c\/p\u003e","published_at":"2025-04-15T19:54:25-07:00","sort_order":"manual","template_suffix":"emtb-cranks-collection","disjunctive":false,"rules":[{"column":"tag","relation":"equals","condition":"crank"},{"column":"tag","relation":"equals","condition":"e*spec"},{"column":"tag","relation":"equals","condition":"component"}],"published_scope":"global","image":{"created_at":"2025-04-15T20:52:56-07:00","alt":null,"width":1956,"height":1956,"src":"\/\/www.ethirteen.com\/cdn\/shop\/collections\/CS4EAA-105_06.jpg?v=1744775576"}}]
Helix Race Carbon e*spec Cranks represent the pinnacle of ultralight carbon e-bike crank design, the highest strength-to-weight available, for All-Mountain applications.
Through years of development and refinement in carbon layup and molding, we've honed the Helix Race Carbon e*spec cranks to deliver the highest strength-to-weight ratio crankset in the e-MTB world. ASTM 5 approved; light enough for Trail and All-Mountain, strong enough for shuttle days at the bike park, with weights as low as 320g. Shed serious grams, while still getting the strength and stiffness demanded by top pros and discerning enthusiasts alike. Available for a wide range of motors, in progressive arm lengths, with e*thirteen’s trademark attention to detail, Helix Race Carbon e*spec cranks are an awesome upgrade for any weight-conscious e-bike build.
Cranks for ISIS Spindle Motor Systems are available in 21.5mm and 26mm offsets to customize fit, Q-factor, and ride feel. 26mm offset cranks are optimized for Bosch® CX Gen4/Gen5 motor frames, but will fit on all ISIS spindle motors. 21.5mm offset cranks are designed for optimal fit with Bosch® SX, Brose® S-Mag, Avinox®, TQ® HPR50 and Specialized® 2.2 & 3.1 motor systems.
Chainring
Pairs perfectly with Helix Race e*spec Chainring (sold separately)
Color
Graphite
Compatibility
26mm offset cranks are optimized for Bosch® CX Gen4/Gen5 motor frames, but will fit on all ISIS spindle motors. 21.5mm offset cranks are designed for optimal fit with Bosch® SX, Brose® S-Mag, DJI® Avinox, TQ® HPR50 and Specialized® 2.2 & 3.1 motor systems.
Included
Crankset, Crank Boots (x2), Sticker, User Manual
Length
155mm, 160mm, 165mm (155mm for ISIS 26mm Offset and Fazua only)
Material
Carbon
Spindle
Compatible with 24mm ISIS, 30mm ETOR, and SRAM® DUB Spindles
