Name: Seatylock Mason
Brand: Seatylock
Availability: InStock
Rating: 90 (76 reviews)

90/100

BikeRide Score

Users (73 ratings)

Experts (3 reviews)

Where to buy

$69.98 Amazon See it $98.99 eBay See it

View all prices Show fewer prices

See at Amazon

We earn affiliate commission. Learn more
Bike Size Charts

BikeRide finds and shows you the best prices of the bikes you want to buy. Prices constantly change and it’s impossible to compare them all yourself.

We search for prices on over 120 bike retailers to guarantee that we find the lowest prices – to save you time and money.

It’s a promise we stand behind: If you find a lower price on a bike elsewhere, we will sell it to you for 10% less. For example, if you find a bike for $480 that we have listed at $500, we will offer you to buy it for $432 through BikeRide. The bike must be the same color and size, sold in the US and not include the use of a coupon.

If you find a lower price, email us at [email protected] with documentation of the price. We’re committed to making sure that the cost of a bike does not keep you from cycling!

Facts

Lock Type

U-Lock

Brand

Seatylock

Weight

2.13, 2.36, 3.37, 3.8 lb

Diameter / Thickness

13.7, 14.1 mm

Length

8, 9.6, 11.22, 14.37 Inches

Width

5.5, 6.7 Inches

Depth

1.37, 1.41 Inches

Material

Hardened Steel, Silicone, Plastic

Summary of Reviews

We have read all expert and user reviews on the Seatylock Mason. In summary, this is what cyclists think.

6 reasons to buy

The Seatylock Mason comes in four sizes, ranging from 8” long (Mason 140) to 14.37” long (Mason 300).

All versions earn Sold Secure’s highest “Diamond” rating, meaning they can withstand prolonged attacks with specialist tools. The Mason 140 and 180 get 3/5 stars from ART.

A tester subjects the Mason to multiple drop tests onto concrete and hammering to the locking cylinder, and it still works.

All versions of this lock are lightweight compared to similarly sized Diamond-rated U-locks.

This lock comes with three keys.

Seatylock provides a three-year warranty for the Mason after owners register the included keys.

2 reasons not to buy

Seatylock doesn’t provide a frame mount for the Mason; it must be purchased separately.

An expert warns the plastic zip ties used for the mount may scratch paint and recommends using protective covering to prevent this.

Bottom line

The Seatylock Mason is a U-lock available in four sizes: Mason 140, 180, 220, and 300. The frame mount costs extra. All versions earn third-party tester Sold Secure’s Diamond rating, but only the Mason 140 and 180 are tested by ART, receiving 3/5 stars. The Diamond rating signifies resistance against prolonged, aggressive attacks with specialist tools. Reviewers praise the Mason 140’s low weight, but all versions are light for the U-lock category. The 220 and 300 are better for thicker frame tubing and anchors. Overall, experts consider the lightweight Seatylock Mason a good value option for high-value bikes in high-risk situations.

Expert Reviews

80/100 based on 3 rated expert reviews

Apply to become an expert

BikeLockWiki

Level 3 expert

Seatylock Mason Review

Level 3 expert

Throughout several weeks of testing, I didn’t run into any real issues with the Mason and enjoyed the way the lock works and the features it uses to keep your bike safe.

Visit full review

Bike to Everything

Level 1 expert