{"product_id":"set-of-adapters-and-taps-bsa","title":"Set of Adapters and Taps BSA","description":"\u003cp\u003eBSA; British Standard Cycle; is the threaded bottom-bracket standard that's been in service on bicycles since the early twentieth century. The shell is 68 mm wide on most road and gravel frames (73 mm on most MTB), with threads of 1-3\/8\" × 24 TPI, right-hand thread on the non-drive side and left-hand thread on the drive side. When those threads go bad; paint overspray after a frame respray, corrosion after damp storage, contamination from a stuck BB cup; the chase tap restores them without cutting new metal.\u003c\/p\u003e\n\u003cp\u003eThe Set of Adapters and Taps BSA chases both the drive-side (left-hand thread) and the non-drive-side (right-hand thread) BSA threads. The set includes the two thread taps, two adapters that mate the taps to a standard tap handle, and the 1697.4 guide that joins the two taps through the shell. Use with our \u003ca href=\"\/en-ca\/products\/handle-for-pedal-taps\"\u003eHandle for Pedal Taps 1695\/4BI\u003c\/a\u003e for the leverage and alignment a BSA shell chase requires.\u003c\/p\u003e\n\u003ch2\u003eWhen to use the BSA chase\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eA frame that's been resprayed, where paint overspray has filled the BB shell threads\u003c\/li\u003e\n\u003cli\u003eA frame that's been stored damp for a winter, where corrosion has built up in unused threads\u003c\/li\u003e\n\u003cli\u003eA frame where the previous BB has been seized in place and left thread distortion when it was finally removed\u003c\/li\u003e\n\u003cli\u003eA new frame from a smaller manufacturer where the threads weren't cleaned at the factory\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe chase removes only paint, corrosion, and burred metal. It does NOT cut new threads. If the BSA shell's threads are genuinely stripped (the BB cup is cutting new threads into the alloy), the fix is a thread insert or; in some cases; a frame retirement. The chase tap is the cleanup tool, not the repair tool.\u003c\/p\u003e\n\u003ch2\u003ePair with the right handle\u003c\/h2\u003e\n\u003cp\u003eThe BSA chase taps engage the \u003ca href=\"\/en-ca\/products\/handle-for-pedal-taps\"\u003e1695\/4BI handle\u003c\/a\u003e via the standard square-shank interface. The handle's magnetic-collet grip holds the tap perpendicular to the shell face throughout the cut, which matters because BSA's thread pitch is fine enough that an off-axis chase cuts the thread out of round.\u003c\/p\u003e\n\u003ch2\u003eWhat's in the set\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTwo BSA thread chase taps (left-hand drive-side, right-hand non-drive-side)\u003c\/li\u003e\n\u003cli\u003eTwo adapters that connect the taps to the magnetic handle, plus the 1697.4 tap guide that joins the two taps through the shell\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThread: 1-3\/8\" × 24 TPI (BSA standard)\u003c\/li\u003e\n\u003cli\u003eSides: left-hand drive (1.3\/8\" L) + right-hand non-drive (1.3\/8\" R)\u003c\/li\u003e\n\u003cli\u003eCompatible with \u003ca href=\"\/en-ca\/products\/handle-for-pedal-taps\"\u003e1695\/4BI Handle for Pedal Taps\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eArticle number: 1697.3 (code 626487); set weight 856 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The BSA chase tap set is part of Unior's bicycle-specific thread-tool catalog (alongside the pedal-thread and frame-thread chase tools). The thread profiles are sized to Unior's machinist-tool specifications, which differ from generic hardware-store taps; a workshop-grade tap cuts the thread profile to a tighter tolerance, which is what gives the chased thread its clean feel.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eThe single best test of whether a BSA shell needs a chase: thread the BB cup in by hand. A clean BSA accepts the cup smoothly to the bottom; a contaminated one stops or feels gritty. Spend the 30 seconds chasing the thread before you force the cup. Our workshop hand tools guide covers thread-chase work and the rest of the workshop hand-tool layer: Workshop hand tools every bike shop needs →\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this set cut new threads or only clean up existing ones?\u003c\/strong\u003e It chases the existing BSA threads. The left and right 1.370\" x 24 TPI taps clear paint overspray, corrosion, and contamination from a fouled shell so cups thread in smoothly again. If the shell's threads are genuinely stripped, a chase cannot rebuild them; that repair is a thread insert or frame work.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich bottom bracket shells does it fit?\u003c\/strong\u003e BSA (English) threaded shells only: 1.370\" x 24 TPI, left-hand thread on the drive side and right-hand thread on the non-drive side. Italian-threaded shells (36 mm x 24 TPI) and press-fit shells use different standards and need different tooling.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need a separate handle to drive the taps?\u003c\/strong\u003e Yes. The 1697.3 set contains the taps, two adapters, and the tap guide, but no handles. The adapters mate the taps to Unior's 1695\/4BI magnetic handle for reamers and taps, sold separately. Unior's 1697-US is the version of this tool that ships with two handles included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat exactly is included, and can I buy the parts separately?\u003c\/strong\u003e Four pieces: the left and right BSA taps (article 1697.1), two adapters (1697.2\/4), and the guide for taps (1697.4) that joins the two taps through the shell. All three articles are also available individually as spare parts, so a worn tap does not mean replacing the whole set.\u003c\/p\u003e","brand":"Unior USA B2B","offers":[{"title":"Default Title","offer_id":46437285527788,"sku":"626487","price":251.83,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0464\/7708\/2777\/files\/1697.3_626487_image_1024-Square.jpg?v=1787170677","url":"https:\/\/b2b.uniorusa.com\/en-ca\/products\/set-of-adapters-and-taps-bsa","provider":"Unior USA B2B","version":"1.0","type":"link"}