{"product_id":"shimano-ultegra-8100-crankset","title":"Shimano Ultegra 8100 Crankset","description":"\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003eShimano Ultegra 8100 Crankset\u003c\/strong\u003e sits at the top of Shimano's second-tier road lineup, bringing 12-speed drivetrain compatibility and technology borrowed directly from Dura-Ace to riders who want serious performance without stepping into flagship territory. Redesigned alongside the full R8100 groupset, it delivers the kind of stiff, efficient power transfer you'd expect from a crankset built for long days in the saddle and hard efforts in the bunch. Two chainring options — 50\/34 compact and 52\/36 mid-compact — and five crank arm lengths give you real flexibility to match your gearing and fit to the riding you actually do.\u003c\/p\u003e\n\n\u003cp\u003eShimano's \u003cstrong\u003eHollowglide construction\u003c\/strong\u003e shapes the chainrings to work in precise coordination with the R8100 chain, designed to make front shifts cleaner and more consistent — particularly under load. The crank arms themselves use a hollow forging process that trims rotational weight while keeping the power path between pedal and chainring as rigid as possible. Like the rest of the R8100 groupset, this crankset is built around 12-speed architecture, which means tighter cassette ratios and smoother cadence through a wider gear range when paired with a compatible rear setup. The overall package comes in only marginally heavier than Dura-Ace, making it a credible choice for road racers, gran fondo riders, and anyone running a performance-oriented build.\u003c\/p\u003e\n\n\u003ch3\u003eShimano Ultegra 8100 Crankset Specs at a Glance\u003c\/h3\u003e\n\u003cul class=\"specs_at_a_glance\"\u003e\n  \u003cli\u003eGroupset compatibility: Shimano Ultegra R8100 (12-speed)\u003c\/li\u003e\n  \u003cli\u003eChainring options: 50\/34 (compact), 52\/36 (mid-compact)\u003c\/li\u003e\n  \u003cli\u003eCrank arm lengths: 160mm, 165mm, 170mm, 172.5mm, 175mm\u003c\/li\u003e\n  \u003cli\u003eConstruction: Hollowglide forged chainrings\u003c\/li\u003e\n  \u003cli\u003eColor: Black\u003c\/li\u003e\n  \u003cli\u003eDesigned for 2x road drivetrain setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDesign Benefits\u003c\/h3\u003e\n\u003col class=\"design_benefits\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHollowglide chainring technology\u003c\/strong\u003e — The profiled chainring teeth are engineered to work with the 12-speed chain geometry, producing front shifts that feel more controlled and less disruptive to your pedal stroke, whether you're sprinting or settling into a tempo effort.\u003c\/li\u003e\n  \u003cli\u003eBroad fit compatibility — With five crank arm lengths spanning 160mm to 175mm and two chainring configurations, the R8100 crankset accommodates a wide range of rider builds and gearing preferences without requiring aftermarket modifications.\u003c\/li\u003e\n  \u003cli\u003eWeight and stiffness balance — Hollow forging keeps arm weight low and torsional rigidity high, so more of what you put into the pedals moves the bike forward — particularly relevant during sustained climbs or accelerations where losses in the drivetrain add up.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e","brand":"Shimano","offers":[{"title":"50x34 \/ Black \/ 160mm","offer_id":43520581599276,"sku":"IFCR8100MX04","price":365.0,"currency_code":"USD","in_stock":true},{"title":"52x36 \/ Black \/ 160mm","offer_id":43520581632044,"sku":"IFCR8100MX26","price":365.0,"currency_code":"USD","in_stock":true},{"title":"50x34 \/ Black \/ 165mm","offer_id":43520581664812,"sku":"IFCR8100AX04","price":365.0,"currency_code":"USD","in_stock":true},{"title":"52x36 \/ Black \/ 165mm","offer_id":43520581697580,"sku":"IFCR8100AX26","price":365.0,"currency_code":"USD","in_stock":true},{"title":"50x34 \/ Black \/ 170mm","offer_id":43520581730348,"sku":"IFCR8100CX04","price":365.0,"currency_code":"USD","in_stock":true},{"title":"52x36 \/ Black \/ 170mm","offer_id":43520581763116,"sku":"IFCR8100CX26","price":365.0,"currency_code":"USD","in_stock":true},{"title":"50x34 \/ Black \/ 172.5mm","offer_id":43520581795884,"sku":"IFCR8100DX04","price":365.0,"currency_code":"USD","in_stock":true},{"title":"52x36 \/ Black \/ 172.5mm","offer_id":43520581828652,"sku":"IFCR8100DX26","price":365.0,"currency_code":"USD","in_stock":true},{"title":"50x34 \/ Black \/ 175mm","offer_id":43520581861420,"sku":"IFCR8100EX04","price":189.99,"currency_code":"USD","in_stock":false},{"title":"52x36 \/ Black \/ 175mm","offer_id":43520581894188,"sku":"IFCR8100EX26","price":189.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/7684\/9196\/files\/shimano-ultegra-8100-crankset-2984052.jpg?v=1771297273","url":"https:\/\/ricycles.com\/products\/shimano-ultegra-8100-crankset","provider":"RA Cycles","version":"1.0","type":"link"}