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 Mountain Bike Pedals Flat Lightweight Carbon Fiber 9/16" Red

Product ID: 222205048

Details

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

🦶Wide platform with 6 traction pins per side for unbeatable grip

⚖️Lightweight at just 334g per pair, built for endurance

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

34556CFA

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Description

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

BUILT TO OUTLAST - High-strength aluminum with anti-oxidation coating resists corrosion and wear season after season.
PLUG PLAY READY - Standard 9/16” spindle fits all major bike types—easy installation, left and right labeled.
GRIP THAT NEVER QUITS - 6 durable threaded traction pins per side lock your shoes in place without damage.
SILENT PRECISION RIDE - Sealed bearings and Cr-Mo spindle ensure noise-free, smooth pedaling every time.
BALANCED POWER PLATFORM - Wide aluminum alloy surface evenly supports your feet for maximum control and comfort.

ROCKBROS Aluminum Alloy Bike Pedals combine a durable 100% Cr-Mo spindle with sealed bearings for smooth, silent performance. Featuring a wide platform with 6 traction pins per side, these lightweight (334g) pedals provide superior grip and foot support. Crafted from high-strength aluminum with anti-oxidation coating, they offer long-lasting corrosion resistance. Compatible with most bike types, these pedals are designed for easy installation and enhanced cycling control.

Specifications

ASIN	B08FDWQJYD
Age Range Description	Adult
Best Sellers Rank	#100,314 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #243 in Bike Pedals
Bike Type	Mountain,Mountain Bike,Road Bike
Brand	ROCKBROS
Brand Name	ROCKBROS
Color	Black
Customer Reviews	4.6 out of 5 stars 617 Reviews
Item Dimensions L x W	4.5"L x 3.9"W
Item Weight	334 Grams
Manufacturer	ROCK BROS
Manufacturer Part Number	K306-BK/US
Material	Aluminum
Material Type	Aluminum
Model Number	K306-BK/US
Product Dimensions	4.5"L x 3.9"W
Product Style	Modern
Style	Modern
Thread Size	16-Sep

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34556CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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