{"product_id":"funn-rsx-direct-mount-bike-stem-31-8mm-adjustable-45-50mm","title":"Funn RSX Direct Mount Bike Stem 31.8mm - Adjustable 45-50mm","description":"\u003cp\u003eIn this review of the Funn RSX Direct Mount Bike Stem, the bottom line is simple: it is built for riders who use dual crown forks and need a rigid, low-weight stem with a small range of adjustable reach. The RSX is clearly aimed at off-road and downhill use, and offers a straightforward, split two-piece design that makes installation and adjustment painless. Riders who value a precision CNC 6061 alloy component with 31.8mm bar compatibility will find this stem delivers solid bar stability and a clean, purposeful look.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect mount design:\u003c\/strong\u003e Built specifically for use with a dual crown fork to provide a secure connection for off-road and downhill riding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e31.8mm bar clamp:\u003c\/strong\u003e This version fits handlebars with a 31.8mm diameter, ensuring a snug fit when the correct bore is selected.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable extension:\u003c\/strong\u003e Offers two effective extension lengths, 45mm and 50mm, which change handling feel and rider position.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual rise options:\u003c\/strong\u003e Provides 20mm and 30mm rise positions via built-in geometry choices for tuning cockpit height.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6061 aerospace alloy construction:\u003c\/strong\u003e CNC machined from 6061 alloy to balance rigidity and light weight for aggressive riding.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe RSX Direct Mount Stem is best for mountain bikers who run dual crown forks, including downhill and aggressive trail riders who need a robust stem that keeps the bar stable under heavy loading. It is also a good upgrade for riders who prefer a clean, split two-piece clamp for easier fitment and maintenance.\u003c\/p\u003e\n\u003cp\u003eRiders who should look elsewhere include anyone with a 35mm handlebar bore, since this listing is specifically the 31.8mm version, or casual riders who do not require the direct mount interface and would prefer a standard threadless stem with a wider range of adjustable reach.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExcellent build quality from CNC 6061 alloy gives a stiff, confidence-inspiring feel.\u003c\/li\u003e\n\u003cli\u003eEasy to install and adjust thanks to the split two-piece design and direct mount fitment.\u003c\/li\u003e\n\u003cli\u003eTwo extension lengths and rise positions let riders fine tune reach and cockpit height.\u003c\/li\u003e\n\u003cli\u003eClean aesthetic and stable clamp keep bars from slipping even under hard use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLimited to the 31.8mm bar bore in this version, so bars with 35mm diameter are incompatible.\u003c\/li\u003e\n\u003cli\u003eThe adjustable range is modest (45mm and 50mm), so riders seeking larger reach changes may need a different stem.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount type\u003c\/td\u003e\n\u003ctd\u003eDirect mount for dual crown forks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBar clamp diameter\u003c\/td\u003e\n\u003ctd\u003e31.8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e6061 aerospace grade alloy (CNC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdjustable extension\u003c\/td\u003e\n\u003ctd\u003e45mm and 50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRise options\u003c\/td\u003e\n\u003ctd\u003e20mm and 30mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesign\u003c\/td\u003e\n\u003ctd\u003eTwo-piece split clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Funn RSX Direct Mount Stem is a focused, well-made option for downhill and off-road riders running dual crown forks who need a stiff, lightweight stem with small extension adjustments. It represents good value when the 31.8mm bore and the limited 45-50mm extension range match the rider's needs, delivering reliable bar stability and a tidy installation.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this stem fit my handlebar?\u003c\/strong\u003e\u003cbr\u003eThis listing is the 31.8mm bar bore version, so it will fit handlebars with a 31.8mm diameter only.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this on a single crown fork?\u003c\/strong\u003e\u003cbr\u003eThe RSX is designed for direct mount installation on dual crown forks; it is not intended for standard single crown threadless steerers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do the adjustable lengths change handling?\u003c\/strong\u003e\u003cbr\u003eSwitching between 45mm and 50mm extension alters reach and steering feel modestly, while the 20mm and 30mm rise positions change cockpit height for rider comfort.\u003c\/p\u003e","brand":"Funn","offers":[{"title":"Default Title","offer_id":48201461924059,"sku":"B01M01PJGO","price":72.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61iB0j_XYjL._AC_SL1500.jpg?v=1770355642","url":"https:\/\/gearmusthave.com\/products\/funn-rsx-direct-mount-bike-stem-31-8mm-adjustable-45-50mm","provider":"GearMustHave","version":"1.0","type":"link"}