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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Rock BROS Mountain Bike Pedals Flat Bicycle MTB Pedals 9/16 Lightweight Road Bike Pedals Carbon Fiber Sealed Bearing Alloy Flat Pedals 1 Pair

Product ID: 222205048

Details

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

🔩100% Cr-Mo spindle with sealed bearings

⚖️Ultra-lightweight at 334g per pair

⚙️6 threaded traction pins per side for grip

€ 42.79

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚴‍♂️ Grip the trail, own the ride — pedal power redefined!

BUILT TO ENDURE - High-strength aluminum with anti-oxidation coating resists corrosion and wear.
SILENT SMOOTH RIDE - Sealed bearings ensure noise-free, fluid pedal rotation for peak performance.
FEATHERLIGHT YET TOUGH - Weighing only 334g, these pedals offer a wide platform without the bulk.
UNMATCHED GRIP CONTROL - 6 durable traction pins per side maximize shoe contact and safety on every trail.
UNIVERSAL FIT EASY INSTALL - Standard 9/16’’ spindle fits most bikes—MTB, road, hybrid, and more.

Rock BROS Mountain Bike Pedals combine a lightweight 334g aluminum alloy body with a durable 100% Cr-Mo spindle and sealed bearings for smooth, silent pedaling. Featuring 6 traction pins per side, these pedals deliver superior grip and control, while their corrosion-resistant coating ensures long-lasting performance. Designed for universal compatibility with a standard 9/16’’ spindle, they fit a wide range of bikes from mountain to road, making them the ultimate upgrade for serious cyclists.

Specifications

ASIN	B08FDWQJYD
Age Range Description	Adult
Best Sellers Rank	#91,295 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #203 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 (616)
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 Type	Aluminum
Model Number	K306-BK/US
Product Style	Modern
Thread Size	16-Sep

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€ 42.79

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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