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Ships within 48 hours · Estimated delivery Jul 26 - Jul 31
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Description
ZENITH GRX12Features Gravel capable aluminum frame Full carbon fork Complete Shimano GRX 12 speed hydraulic groupset Clearance for 700 x 45 tires FSA e system HM. 2 & 250Wh integrated battery Specifications Frame Aluminum Fork Full carbon tapered 1 1 2 to 1 1 8 in Sizes XXS XS S M L XL Shifters Shimano ST RX610 2x12 Front Derailleur Shimano RD RX820 Rear Derailleur Shimano FD RX820 Brakes Shimano RX 400 flat mount hydraulic disc Crank Shimano FC RX610 Chainrings
Features
- Gravel capable aluminum frame
- Full carbon fork
- Complete Shimano GRX 12 speed hydraulic groupset
- Clearance for 700 x 45 tires
- FSA e-system HM.2 & 250Wh integrated battery
Specifications
| Frame | Aluminum |
| Fork | Full carbon tapered 1-1/2 to 1-1/8 in |
| Sizes | XXS-XS-S-M-L-XL |
| Shifters | Shimano ST-RX610 2x12 |
| Front Derailleur | Shimano RD-RX820 |
| Rear Derailleur | Shimano FD-RX820 |
| Brakes | Shimano RX 400 flat mount hydraulic disc |
| Crank | Shimano FC-RX610 |
| Chainrings | 46-30 |
| Bottom Bracket | Shimano sealed PF86 |
| Cassette Cogs | Shimano 11-34 |
| Chain | Shimano M6100 HG 12s |
| Headset | FSA integrated sealed |
| Handlebar | FSA NS Adventure compact 12° flare |
| Stem | FSA Gossamer +/-6° |
| Grips/Tape | Velo VexGel diamond grip |
| Saddle | Opus Gravel |
| Seatpost | FSA Gossamer 27.2 x 350 mm |
| Wheels/Rims | FSA Team 30 i23 |
| Hubs | FSA 12 x 100 mm / 12 x 142mm |
| Tires | Vittoria Terreno T50 Mixed Gravel Endurance 700x40c |
| Pedals | N/A |
| Other | FSA HM2.0 245W 40Nm hub motor |
| Other | FSA e-system 250Wh 36V 6.8Ah battery |
| Other | Optional 180Wh 36V 4.8Ah range extender battery |
Geometries
| SIZE | XXS | XS | S | M | L | XL |
| SIZE (CM) | ||||||
| RIDER (± 5CM) | 155 | 160 | 168 | 175 | 183 | 190 |
| RIDER (± 2") | 5’1” | 5’3” | 5'6" | 5’9” | 6’0” | 6'3" |
| SEAT TUBE | 420 | 450 | 480 | 510 | 545 | 580 |
| TOP TUBE | 515 | 530 | 544 | 559 | 578 | 599 |
| HEAD TUBE | 115 | 135 | 155 | 175 | 195 | 215 |
| HEAD ANGLE | 69.75 | 70.5 | 71 | 71.5 | 72 | 72.5 |
| SEAT ANGLE | 75 | 74.5 | 74 | 73.5 | 73 | 72.5 |
| CHAIN STAY | 428 | 428 | 430 | 430 | 432 | 432 |
| BB DROP | 80 | 78 | 76 | 74 | 73 | 72 |
| STACK | 534 | 554 | 573 | 592 | 611 | 631 |
| REACH | 372 | 376 | 380 | 384 | 391 | 400 |
| STAND OVER | 684 | 709 | 735 | 760 | 789 | 815 |
| BAR | 380 | 400 | 420 | 420 | 440 | 440 |
| STEM | 70 | 80 | 90 | 90 | 100 | 100 |
| CRANK | 165 | 170 | 170 | 172.5 | 172.5 | 175 |
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
4.8 ★★★★★
Based on 5 reviews
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Product Reviews
★★★★★ 4
Great for pajama shirts
Size: Large, Color: White 4-pack
Shirts are true to size. The material is soft and not too thin. We used these as pajama shirts for my preteen and he got a lot of use out of them.
Pro - cheap and well made
Con - they did shrink slightly after a few washes so the shirt is shorter. Didn’t impact our use though
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Reviewed in the United States on April 20, 2026
★★★★★ 3
Pay attention to the size chart
Size: Large, Color: White 2-pack, Size: Large, Color: White 2-pack
Good price for 2 undershirts. Retail price on the item packaging says $16.95. The shirts are thin and semi see-through but these are meant to be layered under another top. Have not washed yet but there's a good chance they will shrink a bit.
Had to return the first time because of inaccurate/unhelpful size chart. For reference, see the actual size chart on the product packaging (I attached to this review). Originally purchased a Medium for a 10yo average build child, it was too short. Large is the correct size.
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Reviewed in the United States on January 30, 2025
★★★★★ 5
X-small comparable to 2T
Size: X-Small, Color: White 2-pack
Got these for my 1.5 year old who fits in 2T pretty well, x small is perfect! They are so soft, a little thin but very happy with the quality
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Reviewed in the United States on August 4, 2025
★★★★★ 5
Perfect undershirt for uniform
Size: Medium, Color: White 4-pack
Material thickness:
I love how soft and thick the shirt is. My kid is comfortable wearing it an undershirt for his uniform. It does not make him hot.
Fit:
Perfect fir for 5yo 60ish lbs
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Reviewed in the United States on June 24, 2025
★★★★★ 5
Soft, comfortable and great value
Special Size: Tank Top, Size: 2-3T, Color: Tank - Toddler - 10 Pack - White, Special Size: Tank Top, Size: 2-3T, Color: Tank - Toddler - 10 Pack - White
I’m very happy with these Fruit of the Loom boys’ tank undershirts. The fabric is soft, lightweight, and comfortable for everyday wear. They fit true to size and hold up well after multiple washes without shrinking too much or losing their shape.
The material is breathable, making them perfect for wearing under school uniforms, T-shirts, or on their own during warm weather. The pack includes several shirts, which makes it a great value for the price.
Overall, these undershirts are durable, comfortable, and affordable. I would definitely recommend them to parents looking for quality everyday basics for their kids.
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Reviewed in the United States on June 5, 2026