can velcro straps be added?

No, there are no designated loops for Velcro straps on these pedals.

Could be use it in a Trek Marlin 6?

Yes, as long as the thread pattern is the standard 9/16 (i think) you should be good. Ive used this same pair on 2 different mountain bikes from 2 different brands with no issues.

these brand new pedals have big resistance. Does it need to unscrew external screw and put some grease inside to have them working smoothly ?

The peddles may be defective. The peddles I bought worked flawlessly out of the box. I screwed them on the arms using the Allen sockets. They felt good when spun by hand. I rode about 60 miles and they work like new. They are on bearings and don't spin like a top but they have very little resistance.

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Mountain Bike Pedals Flat Lightweight Aluminum Alloy 9/16" Red

Product ID: 222205048

Details

Brand
ROCKBROS
Color
Black
Item Weight
334 g
Material
Aluminum
Product Dimensions
4.5"L x 3.9"W

🦶6 durable traction pins per side for unbeatable grip

⚖️Only 334g pair with wide platform for stable, lightweight control

⚙️100% Cr-Mo spindle & sealed bearings for ultra-smooth ride

$48.62

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚴‍♂️ Ride Smooth, Grip Tight, Go Farther — Pedals That Keep Up With Your Hustle

GRIP THAT NEVER QUITS - 6 threaded traction pins per side lock your shoes in place—ride confidently on any terrain.
FEATHERWEIGHT STABILITY - At just 334g per pair, the wide aluminum platform balances lightness with superior foot support.
BUILT TO BRAVE THE ELEMENTS - Anti-oxidation coating and high-strength aluminum frame deliver unmatched durability and corrosion resistance.
SILENT PRECISION ENGINEERING - Sealed bearings and Cr-Mo spindle ensure whisper-quiet, frictionless pedaling every ride.
UNIVERSAL FIT EFFORTLESS INSTALL - Standard 9/16” spindle fits all major bike types—MTB, road, hybrid, and more. Left/right marked for quick setup.

The ROCKBROS Mountain Bike Pedals combine a lightweight 334g aluminum alloy body with a durable 100% Cr-Mo spindle and sealed bearings for smooth, noise-free pedaling. Featuring 6 traction pins per side, these pedals maximize grip without damaging shoes, while their wide platform enhances foot stability across mountain, road, and hybrid bikes. Engineered with anti-oxidation coating, they resist corrosion and wear, ensuring long-lasting performance. Compatible with standard 9/16” spindles, installation is quick and universal.

Specifications

ASIN	B08FDWQJYD
Age Range Description	Adult
Best Sellers Rank	#142,807 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #289 in Bike Pedals
Bike Type	Mountain,Mountain Bike,Road Bike
Brand Name	ROCKBROS
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (628)
Item Dimensions L x W	4.5"L x 3.9"W
Item Highlight	Smooth Sealed Bearings, Grip Pins Keep Shoes Secure, Wide Platform for Stable Ride, Fits Road/MTB/City Bikes
Item Weight	334 g
Manufacturer	ROCK BROS
Manufacturer Part Number	K306-BK/US
Material Type	Aluminum
Model Number	K306-BK/US
Number of Items	1
Product Style	Modern
Thread Size	16-Sep

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