{"product_id":"microshift-m21-6-7-speed-rear-derailleur-claw-hanger","title":"microSHIFT M21 Rear Derailleur 6\/7-Speed Long Cage Claw Hanger","description":"\u003cp\u003e\u003cstrong\u003eAffordable replacement rear derailleur for older 6 and 7-speed bikes using claw-style hanger mounting.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe microSHIFT M21 rear derailleur is designed to bring older mountain bikes, hybrids, comfort bikes, and recreational bicycles back to reliable shifting performance without expensive upgrades. Built for compatibility with Shimano 6 and 7-speed systems, the M21 uses a long cage design to support wide gearing ranges while including a dropout claw hanger for frames that lack a built-in derailleur hanger.\u003c\/p\u003e\n\n\u003cp\u003eThis makes it an excellent repair solution for older bikes, department store bikes, and many entry-level recreational bicycles still in active use.\u003c\/p\u003e\n\n\u003cbr\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey Functional Details\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible with Shimano 6 and 7-speed shifters\u003c\/li\u003e\n\u003cli\u003eLong cage design supports double and triple crank setups\u003c\/li\u003e\n\u003cli\u003eSupports cassette\/freewheel cogs up to 32T\u003c\/li\u003e\n\u003cli\u003eIncludes dropout claw hanger attachment\u003c\/li\u003e\n\u003cli\u003eCompatible with many older bikes lacking replaceable derailleur hangers\u003c\/li\u003e\n\u003cli\u003eDurable composite and steel construction\u003c\/li\u003e\n\u003cli\u003eGreat repair option for budget drivetrain restorations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cbr\u003e\n\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eModel: M21 Rear Derailleur\u003c\/li\u003e\n\u003cli\u003eSpeed Compatibility: 6\/7-Speed\u003c\/li\u003e\n\u003cli\u003eCompatibility: Shimano Road and Mountain Systems\u003c\/li\u003e\n\u003cli\u003eCage Length: Long Cage\u003c\/li\u003e\n\u003cli\u003eLargest Supported Cog: 32T\u003c\/li\u003e\n\u003cli\u003eChain Wrap Capacity: 43T\u003c\/li\u003e\n\u003cli\u003eMount Type: Dropout Claw Hanger\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003eWeight: 316g\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cbr\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompatibility \u0026amp; Technical Notes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible with Shimano-compatible 6 and 7-speed shifters\u003c\/li\u003e\n\u003cli\u003eDesigned for bikes using claw-style derailleur mounting systems\u003c\/li\u003e\n\u003cli\u003eIdeal for frames without integrated derailleur hangers\u003c\/li\u003e\n\u003cli\u003eSupports many freewheel and cassette-based drivetrains\u003c\/li\u003e\n\u003cli\u003eMaximum cog size is 32T\u003c\/li\u003e\n\u003cli\u003eNot compatible with modern 8\/9\/10\/11\/12-speed indexing systems\u003c\/li\u003e\n\u003cli\u003eDerailleur hanger alignment strongly affects shifting performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cbr\u003e\n\n\u003cp\u003e\u003cstrong\u003eService \/ Ownership Context\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExcellent repair solution for older bikes still worth maintaining\u003c\/li\u003e\n\u003cli\u003eCommon replacement for bent or damaged rear derailleurs\u003c\/li\u003e\n\u003cli\u003eClaw hanger simplifies repairs on bikes without replaceable hangers\u003c\/li\u003e\n\u003cli\u003eIdeal for economical tune-ups and drivetrain refreshes\u003c\/li\u003e\n\u003cli\u003eOften installed alongside new cables, housing, and chain replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cbr\u003e\n\n\u003cp\u003e\u003cstrong\u003eFit \u0026amp; Use Signals\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGood Fit:\u003c\/strong\u003e Older mountain bikes, hybrids, comfort bikes, recreational bikes, department store bikes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot A Fit:\u003c\/strong\u003e Modern 9-12 speed drivetrains, direct mount hanger systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse Case:\u003c\/strong\u003e Budget drivetrain repair, derailleur replacement, older bike restoration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv data-ai=\"mechanic-insight\" style=\"display:none\"\u003e\n\u003cstrong\u003e1. Real Mechanic Insights\u003c\/strong\u003e\n- Many older bikes without derailleur hangers can only use claw-mounted derailleurs like this\n- Poor shifting on older bikes is often cable friction, not the derailleur itself\n- Bent claw hangers dramatically affect shifting alignment\n- These derailleurs are extremely useful for keeping inexpensive bikes rideable without major upgrades\n\n\u003cstrong\u003e2. Typical Customer Searches\u003c\/strong\u003e\n- “6 speed rear derailleur”\n- “7 speed derailleur with hanger”\n- “replacement derailleur for old bike”\n- “claw mount rear derailleur”\n\n\u003cstrong\u003e3. Often Replacing\u003c\/strong\u003e\n- Bent OEM derailleurs\n- Rusted entry-level derailleurs\n- Broken derailleur hangers on older bikes\n\n\u003cstrong\u003e4. Good Fit \/ Not A Fit\u003c\/strong\u003e\n- Good Fit: Older Shimano-compatible 6\/7-speed bikes with claw mount needs\n- Not A Fit: Modern cassette systems requiring direct hanger mounting\n\n\u003cstrong\u003e5. Recommended Shop Pairings\u003c\/strong\u003e\n- Shift cable and housing replacement\n- New chain installation\n- Freewheel\/cassette replacement\n- Rear derailleur adjustment service\n\n\u003cstrong\u003e6. What Customers Compare This To\u003c\/strong\u003e\n- Shimano Tourney derailleurs\n- SunRace 6\/7-speed derailleurs\n- Older SRAM entry-level systems\n- OEM department store bike derailleurs\n\u003c\/div\u003e","brand":"MicroSHIFT","offers":[{"title":"Default Title","offer_id":53447093158202,"sku":"GG-DER-MSHIFT-M21-67SP-CLAW","price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0745\/5735\/8394\/files\/RD0211.jpg?v=1778635878","url":"https:\/\/gograva.com\/products\/microshift-m21-6-7-speed-rear-derailleur-claw-hanger","provider":"Grava Adventure Corporation","version":"1.0","type":"link"}