.pm-pdp { font-family: inherit; font-size: inherit; color: inherit; } .pm-pdp h4 { font-size: 16px; font-weight: 700; margin: 28px 0 8px; border-bottom: 1px solid #e0e0e0; padding-bottom: 4px; } .pm-pdp p { margin: 0 0 12px; } .pm-pdp ul { margin: 0 0 12px; padding-left: 22px; } .pm-pdp li { margin-bottom: 5px; } .pm-pdp a { color: #0055cc; } .pm-pdp .note { font-style: italic; font-size: 13px; color: #555; } .pm-divider { border: none; border-top: 1px solid #e5e5e5; margin: 32px 0; } .pm-callout { border-left: 3px solid #111; padding: 14px 20px; margin: 20px 0; background: #fafafa; } .pm-callout .head { font-size: 15px; font-weight: 700; color: #111; margin-bottom: 6px; } .pm-callout .body { font-size: 13px; color: #444; line-height: 1.6; margin: 0; } .pm-advisory { background: #fff8e6; border: 1px solid #f0d080; border-radius: 8px; padding: 14px 20px; margin: 16px 0; font-size: 13px; color: #5a4000; line-height: 1.6; } Pair this with any Carbon Road build. This upgrade replaces the stock SRAM Rival crankset with the power meter variant before your bike leaves our bench. Same crank, same chainrings, same crank length sized to your frame — with a strain gauge inside the spindle. Add it now, not later. Retrofitting power to a bike you already own means buying a second complete crankset and having the first one sit in a box. Adding it at build time means you pay the difference between two cranks rather than the price of a whole one — and a standalone power meter typically costs more than that difference on its own. How it works The strain gauge lives in the spindle rather than in the chainrings, pedals, or crank arm. That location keeps it protected from crash damage and road debris, and it means the measurement doesn't change if you swap chainrings down the line. It measures your left leg and doubles it. This is a single-sided system, and it's worth understanding before you add it: For training, it works. Structured training depends on consistency, not laboratory accuracy. The same meter reading the same leg the same way, ride after ride, gives you intervals, zones, and progression you can actually train against. It won't show leg imbalance, because it can only see one leg. If you're rehabbing an injury or specifically chasing L/R balance data, you want a dual-sided system. If you have a significant imbalance, your total number will skew in whichever direction your left leg differs. It'll still be consistent — just offset. Most riders' imbalance is small enough not to matter for training purposes. Battery and durability 400+ hours per battery. Ten hours a week gets most riders through the better part of a year. User-replaceable AAA lithium battery. No charging cable, no dock, no proprietary cell. Use a lithium AAA, not alkaline — alkaline cells drop voltage differently and give unreliable readings and short life. IPX7 rated — submersible to one meter for 30 minutes. Rain, road spray, and wash-downs are a non-issue. Under 40g added over the standard crankset. It broadcasts on ANT+ and Bluetooth, so it pairs with essentially any head unit, watch, or training app. Fitment Compatible with all Carbon Road builds — 2x and 1x Aero, every colorway Crank length is sized to your frame — 165mm on XS through M, 170mm on L and XL Chainrings match your selected build — no change to your gearing Must be added to a complete bike order. This upgrade is performed at build; it is not sold as a standalone crankset. ?? Standard and power meter cranksets use different spindles and are not interchangeable. If you are ordering this for any application other than a State Bicycle Co. Carbon Road build, verify your frame's specified chainline before ordering. Installation and calibration Installed and calibrated by our mechanics as part of your build, so it arrives ready to pair with your head unit. Recalibrate whenever you change the battery or move the crank to a different bike. It takes about thirty seconds from your head unit or the SRAM AXS app. Full documentation is available in SRAM's service hub for this model . Specifications Model: FC-RIV-P-E1 Measurement: Spindle-based, left-side, doubled for total Battery: AAA lithium, user replaceable Battery life: 400+ hours Water resistance: IPX7 — 1 meter for 30 minutes Transmission: ANT+ and Bluetooth Added weight: Under 40g vs the standard crankset Spindle interface: DUB Crank length: 165mm (XS–M) or 170mm (L–XL) OE product information Not intended for retail sale. This is original-equipment product supplied for dealer service, warranty replacement, and complete-bike build applications. OE product is the same component that ships on complete bikes — identical specification, identical performance. What differs is how it's supplied: Plain bulk or poly packaging rather than a retail box No printed manuals or quick-start guides — all documentation is available free from SRAM's service hub, linked above No retail hang tags or display materials Small-parts and hardware content may differ from the retail pack Components may show minor handling marks from bulk packing Warranty. SRAM's consumer warranty program does not apply to original-equipment components. Warranty and defect claims on this item are administered by State Bicycle Co. Contact our support team with your order number. Crash damage, wear items, and installation damage are not covered. Custom configuration produced by SRAM at the request of State Bicycle Co. Original equipment service item supplied in OE packaging for dealer service, warranty replacement, and complete-bike build applications; not a retail-packaged consumer product and not intended for retail sale. SRAM consumer warranty does not apply to original-equipment components — warranty administration on this item is provided by State Bicycle Co. Standard and power meter versions use different spindles and are not interchangeable; verify your frame's specified chainline before ordering. Professional installation recommended. Power measurement is single-sided; total output is calculated from left-side data. SRAM, Rival, AXS, DUB, X-SYNC, XPLR, Flattop, and T-Type are trademarks of SRAM LLC. State Bicycle Co. is not affiliated with or endorsed by SRAM LLC. Specifications subject to change without notice.