Best in 7 days
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Ships within 48 hours · Estimated delivery Jun 23 - Jun 28
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Description
4iiii PRECISION 3+ Left-Side Powermeter - Factory InstallThe 4iiii PRECISION 3+ Powermeter is the ultimate combination of accuracy, durability, and lightweight design. Whether you are a Tour de France pro, a Mountain Bike World Champion, Ironman triathlete, a Zwift racer, or a cyclist simply looking to add the structure of data to your training, this crank based power meter provides the consistent data you need to unlock your potential. Engineered to be the best affordable power meter on the market, the
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- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.7 ★★★★★
Based on 1704 reviews
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Product Reviews
★★★★★ 5
Better sleep, better mood
This definitely helped my mood and sleeping. It literally changed my default. The only electrolyte that can pass the blood brain barrier. I recommend.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 9, 2026
★★★★★ 5
For better sleep and consultation and calming effect.
It seems to work for me, it makes me calm but energetic, plus I sleep for 8 hours since taking it.
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Reviewed in the United States on May 10, 2026
★★★★★ 3
Not working for me 100%
Still not sure about how this magnesium affects me. I have only been taking one tablet an hour or two before bedtime. Seems like sometimes I can’t go to sleep after taking it, charges up my brain. Other times I sleep but have crazy dreams. Maybe it works for some, but not others. I’ll try to finish the bottle, but the lack of sleep after taking the Magnesium L-Threonate makes me hesitant to continue some nights. That’s mainly the reason I purchased this brand to include the reviews.
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Reviewed in the United States on February 12, 2026
★★★★★ 5
Helps Relax the muscles
I like to take a magnesium supplement daily, usually in the evening before going to be as it helps relax me for sleep
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Reviewed in the United States on May 3, 2026
★★★★★ 5
Good product
Gives a good amount of energy
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Reviewed in the United States on March 18, 2026
