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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ROCKBROS Rock BROS Mountain Bike Pedals Flat Bicycle MTB Pedals 9/16 Lightweight Road Bike Pedals Carbon Fiber Sealed Bearing Flat Pedals Black

Product ID: 261341209

Details

Brand
ROCKBROS
Colour
Black
Item weight
334 Grams
Material
Aluminum
Style
Modern

🦶6 durable traction pins per side for unbeatable grip

⚖️Ultra-light 334g pair with wide platform for balanced support

⚙️100% Cr-Mo spindle & sealed bearings for smooth, noise-free spin

Description

🚴‍♂️ Elevate your ride with pedals that grip, glide, and go the distance!

PLUG PLAY READY - Standard 9/16” spindle fits all your bikes—MTB, road, folding, and beyond.
GRIP THAT WONT QUIT - 12 aggressive traction pins lock your shoes in place, rain or shine.
SILENT PRECISION SPIN - Sealed bearings + Cr-Mo spindle ensure whisper-quiet, frictionless pedaling.
FEATHERWEIGHT POWERHOUSE - At just 334g, these pedals deliver stability without the bulk.
BUILT TO BRAVE THE ELEMENTS - High-strength aluminum with anti-oxidation coating resists corrosion and wear.

The ROCKBROS Mountain Bike Pedals combine a lightweight aluminum alloy body with a durable 100% Cr-Mo spindle and sealed bearings for smooth, noise-free performance. Featuring 6 traction pins per side, these pedals provide superior grip and control across all terrains. Their wide platform supports your feet evenly, enhancing comfort and stability. Designed with corrosion-resistant coating and a universal 9/16” spindle, they fit a wide range of bikes from mountain to road and folding models, making them a versatile upgrade for serious cyclists.

Specifications

ASIN	B08FDWQJYD
Age Range Description	Adult
Bike Type	Folding Bike, Mountain Bike, Road Bike
Brand Name	ROCKBROS
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (358)
Item Weight	334 Grams
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	9/16

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