Mountain Biking - Unramped/unpinned chainrings

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.



PDA

View Full Version : Unramped/unpinned chainrings

gregseto
04-07-05, 11:36 PM
Does anybody know the drawbacks to unramped/unpinned chainrings? I'm thinking that the chain will wear faster, and the shifting would be slower. How much slower is the shifting? Enough to piss me off, or is it a matter of milliseconds?

jeff williams
04-07-05, 11:48 PM
I didn't notice slower, not as smooth.
The ramps\low teeth make the chain come off @ the correct part of the crank revolution.
I may be wrong, but I thought they were mostly used with index shifting.....naw, that can't be.

Anyway...I really didn't like the ramped ring on my mtb triple, thin and flexy.
handlebarsfsr
04-08-05, 11:31 AM
unramped/unpinned is made for single ring setups where no front shifting is done.

cyccommute
04-08-05, 11:39 AM
unramped/unpinned is made for single ring setups where no front shifting is done.

Ramped and pinned chainrings are made because Shimano, in their infinite wisdom, wanted it that way because it just a tad faster and then made it so that none of their stuff would work quite right without them. Chainrings that just have teeth on them (no fancy stuff) have worked for years without trouble and still work today but just a little slower than ramped ones.
jeff williams
04-08-05, 11:42 AM
unramped/unpinned is made for single ring setups where no front shifting is done.
I have road doubles no ramps and mountain triples no ramps...
But my single ring is a non-ramped ring, mounted mid triple where that stupid flexy ramp ring was.

But ya...single ring setups =no need for ramps.
Dirtbike
04-08-05, 01:49 PM
We got some E.13 single ring chainrings and dayum they are nice, and they dont have pins or ramps.
mtbikerinpa
04-08-05, 06:27 PM
I have raced on treated and untreated rings and the efficiency and reliability is actually slightly better with untreated rings. The reason for pins and gates is to allow the chain to fall off the rings at given aligned points, making it a reliable and predictable process. In adverse conditions, such as rock gardens or slalom or the like, a treated ring can be a liability since it will shift easier. Intentional or not.
For normal conditions, there are few reasons to go with untreated rings. Untreated can be a hassle to shift with, particularly on uphill shifts(which are hard anyway).