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- USA
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Ships within 48 hours · Estimated delivery Aug 17 - Aug 22
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Description
Rival 1x XPLR Powermeter E1Light and accurate spindle based power unit nestles into redesigned arms to give you the data you need Spindle based unit measures left side power to calculate total watts Long battery life (400+ hours) to power a season of rides User replaceable AAA lithium battery Lightweight (less than 40g heavier than standard crankset) Wide chainline for compatibility with Full Mount rear derailleurs SRAM Model ID: FC RIV 1WP E1 Attributes BB Inclusion No BCD
- Light and accurate spindle-based power unit nestles into redesigned arms to give you the data you need
- Spindle-based unit measures left side power to calculate total watts
- Long battery life (400+ hours) to power a season of rides
- User replaceable AAA lithium battery
- Lightweight (less than 40g heavier than standard crankset)
- Wide chainline for compatibility with Full Mount rear derailleurs
- SRAM Model ID: FC-RIV-1WP-E1
Attributes
| BB Inclusion | No |
| BCD | Direct Mount SRAM 8 Bolt |
| Chainline | 47.5mm |
| Connectivity | ANT+, BT LE |
| Crank Spindle Diameter | 28.99mm |
| Crankset Material | Aluminum |
| Drivetrain Spacing | Road |
| Interface | DUB |
| Pedals Thread | 9/16'' |
| Primary Color | Black |
| Speed | 12/13 |
| Teeth | 42 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 5
surprised!
I actually didn't realize I had ordered "time released" version. I thought these were just normal melatonin. But now that I've tried these, I love them so much better than the regular version! Helps me sleep better through the night. No taste, love this brand of Source Naturals.
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Reviewed in the United States on October 17, 2025
★★★★★ 5
The only one I'll use!
As the title says, this is the brand to get!! It's fast-acting, doesn't give me weird dreams like some do, and I never wake up feeling groggy.
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Reviewed in the United States on March 13, 2025
★★★★★ 5
Works wonders
I've been buying these for well over a year now as Subscribe and Save. I work 12 hour overnights as a nurse. My sleep schedule normally gets messed up. I would have no problem falling asleep but would wake up only a few hours later which is not good when you have work again that night. We buy these on Amazon due to the great price and the fact that they are extended release which helps keep me asleep longer. When I take 1 or 2 of them, I am able to sleep about 7-8 hours which is great. I take this both when I sleep during the day and sleep during the night. It helps me sleep no matter when and I am able to adjust my sleep schedule often. I have recommended them to many.
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Reviewed in the United States on January 10, 2013
★★★★★ 4
Works quite well, dose still a bit high for me
Used to take the Natrol 5mg slow release, now that I can compare these 2, I love this more. It doesn't make me feel too edgy, it's quite relaxing actually. I still have to halve the dose as the full dose makes me groggy the next day. Where the Natrol gave me very vivid, but not unpleasant dreams, these don't make me dream as vividly. It does take a bit longer to get me to sleep, but once asleep, your asleep. Highly recommend, once I finish this bottle, I'd get the 2mg tr next time, as a lower dose works better for me.
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Reviewed in the United States on July 10, 2014
★★★★★ 5
Excelente Muy Satisfecho
Servicio excepcional, cuidadoso, el producto muy bien empacado. Y el tiempo de entrega fue el acordado. Y del producto ni hablar, excelente.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 3, 2026
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