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Ships within 48 hours · Estimated delivery Sep 23 - Sep 28
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Description
GRX FC-RX820-1 42TThe new FC RX820 1 crank balances weight and efficiency for mixed terrain riding. Gearing options cater for the specific demands of gravel riding and to maintain tighter gear steps for maintaining pedaling rhythm. GRX 12 speed, hollow arm 1X crankset. Narrow wide 42T chainring. Gravel specific gearing ratios with 1X simplicity and wide range gearing. Bottom Bracket : Not included SM BBR60 SM BB72. Chainline: 50. 1mm. Attributes BB Inclusion No BCD 110
- The new FC-RX820-1 crank balances weight and efficiency for mixed-terrain riding. Gearing options cater for the specific demands of gravel riding and to maintain tighter gear steps for maintaining pedaling rhythm.
- GRX 12 speed, hollow arm 1X crankset.
- Narrow-wide 42T chainring.
- Gravel specific gearing ratios with 1X simplicity and wide-range gearing.
- Bottom Bracket : Not included - SM-BBR60 / SM-BB72.
- Chainline: 50.1mm.
Attributes
| BB Inclusion | No |
| BCD | 110 |
| Chainline | 49.7mm |
| Crank Spindle Diameter | 24mm |
| Crankset Material | Aluminum |
| Drivetrain Spacing | Road Disc |
| Interface | Hollowtech II |
| Pedals Thread | 9/16'' |
| Primary Color | Black |
| Speed | 12 |
| 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
4.4 ★★★★★
Based on 10 reviews
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Product Reviews
★★★★★ 3
Falls regularly
It works for a bit but falls from my screen on a very regular basis no matter how tight I tighten it or what position the phone is in. The magnet it strong, but the mount itself doesn’t hold on to the screen where it’s supposed to.
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Reviewed in the United States on February 13, 2026
★★★★★ 5
Great mount
Really like this mount: Very versatile, no glue
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Reviewed in the United States on February 17, 2026
★★★★★ 4
It holds the phone pretty well!
Updated review:
I gave this another try and it worked, the reason was previously I was rotating the nob in the wrong direction... now it fits pretty well and stays in the installed position securely! But I'm still worried about the added pressure on the display, hopefully it works fine. Overall I think it's worth a try if you need a magnetic phone holder!
(ps: I was never contacted by the manufacture, I figured out the correct way to use it so I came here to update my review)
---
Original title:
Doesn't fit my Model 3 display too well, and it adds pressure on it. I wouldn't recommend it
Original review:
I don't understand all the positive reviews of this MagSafe holder. It could work, but I find it very unstable on my Model 3 2023's display. After I fit it onto the display and tried adjusting the angles or taking off the phone, the holder tended to fall off. Also it adds pressure to the display which could technically damage it. I wouldn't recommend this.
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Reviewed in the United States on May 22, 2024
★★★★★ 5
👍👍👍
🥰🥰🥰
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Reviewed in the United States on December 21, 2025
★★★★★ 1
not holding up well
It was a great idea and kinda worked for few weeks.. but every time I have to jiggle a bit to get my phone off from magnet or try to adjust the angle, the whole system comes off.. and now all the supporting sponges came off.. I tried to fix and reuse but didn't last at all.. it comes off too easily from the car monitor.
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Reviewed in the United States on December 27, 2024
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