Note: I will be making more of these in February 2024
Note: the photos of the ASS on the red frame is the final production version with the silver brazed alignment cam and bronze brazed clamp boss. On the Turkish green frame you see the prototype ASS.
Eerder metaal #ASS (Anti Seatpost Slippage device) Mk3 is designed to act as additional clamp on top of the Brompton seatpost clamp to minimize the seatpost sliding down. The Mk3 version has the lowest stack height of all three versions (making your Brompton more compact than before), the most effective (actually very effective!) and the lighest. Also it's the first version to feature the alignment cam to prevent the seatpost from rotating when the original Brompton quick release can't keep it from rotating.
The #ASS is very useful for heavy riders to not have to overtighten the seatpost QR clamp (to prevent destroying the plastic seat sleeve and eventually causing the seat tube to develop cracks near the end of the slot at the back side.
The #ASS is also very effective on titanium seatposts which are due to the lower stiffness harder to firmly clamp and thus more likely to slide down during the ride. (the Young's Modulus of titanium, which defines the materials stiffness, is half of that of steel)
The #ASS can be used in combination with a #seatposthugger or big saddle bag to prevent the seatpost from sliding down as a result of all the extra weight.
It features an adjustable (pull and turn) Elesa thumb lever. When opened 1 1/2 to 2 turns counter clockwise the ASS can slide up or down the seatpost and a when tightened it's pretty tight and locks the seatpost into the set height.
- RAW lacquer, clear gloss powdercoated with an industrial look, some discoloration from brazing might be visible
- Bronze and silver fillet brazed, (RAW, unfiled fillets)
- 0.9mm wall thickness Chromoly tubing
- including the original, but modified Brompton seat post sleeve. The sleeve is not glued for easy replacement if ever needed. It's hold by the cam, so won't come out by itself.
- adjustable Elesa thumb lever
- weight complete: 58 gram