Front View: Closed	Rear View: Closed
Front View: Open for Rigging	Rear View: Open for Rigging

Technical Details

I acquired my Rollgliss R250 from JohnBoysGear in 2021.

The Rollgliss R250 is 105 mm. tall, 76 mm. wide, 33 mm. thick, and weighs 161 g.

The shell is a tall irregular shaped stamping made from 4.1 mm. aluminum alloy sheet metal painted red. The stamping has one reinforcing rib behind the cam. The ascender is right-handed, as are similar ascenders made by others. A 15 mm. rope channel is formed in the left side and a smaller cam channel lies to the right. A hole drilled through both sides of the cam channel accepts a 5 mm. roll rivet. The cam and cam spring are mounted on this rivet. The rivet is centered 46 mm. from the inside of the rope channel. A 13.6 mm. sling attachment hole is punched below the cam, and a 6.0 mm hole is punched above the cam. There is a stamped cam stop.

The cam is a plated skeletonized steel casting. The cam radius increases from 38 to 52 mm. over an angle of 39°, giving a 24° cam angle. The cam has number of small conical teeth, all of which have their axes approximately in line with the corresponding radius from the cam pivot. The tooth pattern is (3.2)^2(1.2)^2(B) pattern, where "B" indicates a bar. There are two notches on each side of the cam face, presumable for mud relief. Unlike some other ascenders, the inner cam face radius appears to be constant. A spring-loaded manual safety bar is mounted on the bottom of the cam with a small semi-tubular rivet. The normal action of the spring holds the safety against the cam. When the cam is opened, the shell interferes with the safety bar, thus preventing opening the cam. If the safety bar is moved away from the cam (opposing the spring), it will clear the shell and the cam will open. At full open the safety can be released and the spring will hold the safety against the back of the shell. This provides a means of locking the cam open. A pin on the safety assists in operating the safety mechanism.

The front of the ascender is printed with "=rollgliss=." The rear is printed with "R250," "RESCUE KIT," "Ref: M990000014," "No SERIE: 00272," and "Mfg Date 02/12."

Comments

The following ascenders are all variations of the same basic design, made by the same company under three different names:

Image Ascender Shell Finish Top Hole(s) Bottom Hole(s) Cam Stop Anthron AB-20, Version A Anodized Two carabiner-size Two carabiner-size (one with webbing slot) None Anthron AB-20, Version B Anodized One carabiner-size, one small Two carabiner-size (one with webbing slot) Stamped Lucky AB-20 Anodized Two carabiner-size Two carabiner-size (one with webbing slot) None Rollgliss R250 Painted One small One carabiner-size Stamped VauDe AB-20 Anodized Two carabiner-size Two carabiner-size (one with webbing slot) None

The Anthron AB-20, Version B differs from the others by having a stamped cam stop and a smaller secondary top hole. The Rollgliss R250 uses the same shell and cam as the Anthron AB-20, Version B (including the cam stop), but has fewer attachment holes, making it slightly heavier and less versatile.

These are well-made ascenders and perform much like the Petzl Basic. All sharp edges have been removed. The cam teeth are very well done. The attachment points are simply holes in the shell, and although rounded they should have been beveled more; even so, I would consider their small radius too sharp for directly attaching rope slings. They are acceptably rounded for webbing, and the unique slot on those that have it makes it easy to sew webbing (up to 35 mm.) in place. Considering the proximity of the attachment points to the main rope, I would recommend using a small maillon for most rope attachments in order to reduce the risk of sling abrasion.

The safety is awkward to use with one hand (like the Petzl Basic). The cam is very well made. The notches don't seem to provide much help in muddy conditions - but nobody else's similar ascender works well either. I'm not sure what purpose the bar serves - several people have sent me emails telling me that the bar keeps the cam from closing and touching the shell. I agree, it does, but so what? Putting the ascender on rope does the same thing. Initially I wondered if the bar would interfere with using the ascender. It does not appear that it will, at least on 9 mm and larger ropes.

I do not like painted ascenders, as the paint wears off and leaves a mess on the rope. Anodizing would have been a better choice.