{"product_id":"soma-jawbone-b-type-mountain-frame-mtbf0204","title":"Soma Jawbone B-Type 58cm Steel Gravel \u0026 Touring Frame - Tange Prestige Butted CrMo Steel, Disc Brake \u0026 Thru-Axle Compatibility, Drop Bar MTB Bikepacking Rigid Frame","description":"\u003cdiv id=\"seqbpdescription-1\"\u003e\u003cp\u003eExperience Versatility and Durability with the Soma Jawbone B-Type Frame - 58cm, 29\" Black\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-2\"\u003e\u003cp\u003eThe Soma Jawbone B-Type Frame is your ultimate foundation for building a rugged, reliable drop bar mountain touring or bikepacking rig. Crafted from premium Tange Prestige heat-treated butted CrMo steel, this frame offers exceptional strength, weight savings, and corrosion resistance, making it ideal for demanding adventures and extended touring. The thoughtfully engineered design combines classic steel craftsmanship with modern performance essentials, providing a seamless blend of durability and ride comfort.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-3\"\u003e\u003cp\u003eMaterials \u0026amp; Construction:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-4\"\u003e\u003cp\u003eConstructed from Tange Prestige heat-treated butted CrMo steel, the Jawbone B-Type frame ensures superior ride quality and longevity. The butted tubing process optimizes wall thickness for strength where needed while reducing weight, enhancing overall bike performance. The frame also features a sturdy rear end with butted CrMo tubing, ensuring reliable durability for rigorous riding conditions.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-5\"\u003e\u003cp\u003ePerformance \u0026amp; Engineering:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-6\"\u003e\u003cp\u003eDesigned for versatile riding styles, the Jawbone B-Type accommodates 29\" wheels with tire widths from 27.5 x 47mm up to 700c x 38mm, supporting a wide range of off-road and on-road adventures. The 71 head angle and 73 seat angle provide a balanced, confident handling experience. The frame is optimized for tire clearance up to 2.6\" (29 x 2.25\"), making it perfect for gravel, mountain touring, and bikepacking setups.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-7\"\u003e\u003cp\u003eComponents \u0026amp; Technology:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-8\"\u003e\u003cp\u003eEquipped with IRD Broski sliding dropouts, this frame offers exceptional gear compatibility-supporting derailleurs and geared hubs like Rohloff through optional inserts (sold separately). The frame includes IS mount disc brake tabs for reliable stopping power with modern disc brakes, and a 73mm bottom bracket shell for smooth drivetrain integration. The 44mm headtube supports 1-1\/8\" and tapered steerer forks (with optional headset swaps), providing flexibility for customization. Additional eyelets for rear racks, fenders, and multiple bottle cages ensure practicality for long-distance touring and bikepacking adventures.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-9\"\u003e\u003cp\u003eStyle \u0026amp; Use Case:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-10\"\u003e\u003cp\u003eFinished in sleek black, the Soma Jawbone B-Type frame boasts a versatile, adventure-ready aesthetic suitable for both urban exploration and rugged off-road adventures. Its robust design makes it ideal for cyclists seeking a dependable platform for bikepacking, gravel grinding, mountain touring, and all-road exploration. Whether you're customizing a bikepacking rig or building a reliable touring bike, this frame delivers unmatched performance and style.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-11\"\u003e\u003cp\u003eInnovative Features \u0026amp; Customization:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-12\"\u003e\u003cp\u003e- Sliding IRD Broski dropouts for seamless derailleur and hub compatibility\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-13\"\u003e\u003cp\u003e- Rear rack, fender, and cargo cage eyelets for increased cargo capacity\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-14\"\u003e\u003cp\u003e- Wide tire clearance for diverse terrain adventures\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-15\"\u003e\u003cp\u003e- Compatible with tapered or straight steerer forks for versatile steering options\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-16\"\u003e\u003cp\u003eSpecifications:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-17\"\u003e\u003cp\u003e- Size: 58cm\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-18\"\u003e\u003cp\u003e- Wheel Size: 29\"\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-19\"\u003e\u003cp\u003e- Top Tube Length: 583mm\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-20\"\u003e\u003cp\u003e- Chainstay: 435-455mm\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-21\"\u003e\u003cp\u003e- Head Tube: 44mm (supports 1-1\/8\" and tapered 1.5\" forks)\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-22\"\u003e\u003cp\u003e- Seat Post Diameter: 27.2mm\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-23\"\u003e\u003cp\u003e- Seat Tube Length: 545mm\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-24\"\u003e\u003cp\u003e- Bottom Bracket: 73mm English Threaded\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-25\"\u003e\u003cp\u003e- Frame Color: Black\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-26\"\u003e\u003cp\u003eUpgrade your cycling setup with the Soma Jawbone B-Type Frame-an expertly crafted, performance-driven platform designed for durability, versatility, and adventure. Perfect for cyclists looking to ride beyond the pavement with confidence and style.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpfeatures\"\u003e\u003cul\u003e\n\u003cli\u003eDurable Tange Prestige heat-treated butted CrMo steel frame offers exceptional strength and flexibility, ideal for rugged mountain touring and bikepacking adventures. \u003c\/li\u003e\n\u003cli\u003eInnovative IRD Broski Sliding Dropouts provide versatile driveline configurations, supporting both derailleur setups and geared hubs like Rohloff, with optional thru-axle compatibility for enhanced stability. \u003c\/li\u003e\n\u003cli\u003eDesigned with a 44mm headtube to accommodate both standard and tapered steerer forks, ensuring future-proof upgrades and a custom fit with matching EC44-compatible forks. \u003c\/li\u003e\n\u003cli\u003eEquipped with multiple eyelets for rear racks, fenders, and cargo cages, making this frame perfect for multi-day bikepacking, touring, and commuting across diverse terrains. \u003c\/li\u003e\n\u003cli\u003ePrecision engineering includes a lightweight yet strong 58cm frame size, optimized for 29\" wheels and tire widths from 27.5 x 47mm to 29 x 2.25\", delivering a smooth ride across varied surfaces.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e","brand":"Soma","offers":[{"title":"Default Title","offer_id":42355335168067,"sku":"MTBF0204","price":769.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1608\/6187\/files\/SF4023.jpg?v=1773628796","url":"https:\/\/365cycles.com\/products\/soma-jawbone-b-type-mountain-frame-mtbf0204","provider":"365 Cycles","version":"1.0","type":"link"}