Posted for Ted:
Sorry for the problems with your setup and for the lack of information while we finish the new proper website.
All 2013 Ciamillo brakes come with all the hardware necessary to accommodate any rim on the market. You should have received the above illustration in the box with your brakes. There should be three types of spherical washers included with the Gravitas brakeset; one set of single sided sphericals, a thick set of double-sided sphericals, and a thin set of double-sided sphericals. Please refer to the above illustration to determine your setup.
Regarding my brakes and wide rims... they work perfectly when setup properly. I licensed the patented cam mechanism to SRAM which validated the superior design over dual pivot. The system allows for a more compact setup as well. However, there were some challenges to the design when presented with the wider rims of late. The solution is in the padholder configuration. It is very easy to get my brakes optimized using the hardware (sphericals). It simply requires selecting the configuration where the cam rises to less than half the total stroke as it makes contact with the rim. There are four rim width configurations possible:
1 - no double sided sphericals : widest rims
2 - thin double side sphericals : wide rims
3 - thick double sided sphericals : standard rims
4 - thick and thin nested together : narrow rims
Issues with brake performance and power are usually a result of improper setup. If the barrel adjuster is used to close the gap on narrow rims (with new pads installed), it uses up stroke to do so. When this happens there could be a condition where half the stroke (or more) is used up by the barrel adjuster. When the lever is then pulled in this situation, more stroke is used up by closing the gap, and the rest may be used up by compression of the pads, flex, and cable stretch... with no stroke left the cam now hits the underside of the barrel adjuster preventing any further clamping of the rim or addition braking force being applied. The solution: move your barrel adjuster back down so the stroke of the cam rests at the most open position for the caliper; close the gap to no more than 2mm per side using the proper combination of double sided sphericals. Done. When the lever is pulled now, approximately 20 to 30% of the stroke will be used to close the gap. Contact will then be made with 70% of the stoke of the cam still available. This is the amount of stroke needed for full application of force and pad life. The barrel adjuster may now be used to keep the gap maintained but when the cam starts hitting the bottom side of the barrel adjuster, it's time to change the pads.
The above condition is the most common issue with my system next to housing length. My brakes drifting off center or having difficulty centering is 100% of the time due to improper housing length. The housing should not push down or pull up on the caliper as this will bias the balanced spring.
In addition to getting your torques on your bolts right, there are really only two unique but important things to remember regarding setup of Ciamillo brakes:
1 - Using the double-sided sphericals, create a gap of around 1.5 to 2 mm per side of the rim without the use of the barrel adjuster.
2 - Cut your housing to a neutral length that does not push down or pull up on the caliper.
If these simple steps are taken, the Gravitas road calipers are the most powerful calipers on the market.
Please contact me directly at 770-364-7933 or firstname.lastname@example.org