Butted Aero Model T(mm) ØD1(mm) w(mm) ØD2(mm) α H(mm) L(mm) Weight(260mm) PBA 1425 9.0 2.0 2.5 1.05 95° 6.2 160-310 5.7 g PBA 1422 9.0 2.0 2.2 0.95 95° 6.2 160-310 4.7 g PBA 1420 9.0 2.0 2.0 0.95 95° 6.2 160-310 4.3 g SPEC Material Sandvik T302 (18/10) Advantage Pillar cold drawn technology.Double butted with three Blade options.Up to 30% weight saving without compromising strength. Thread Rolled (BC 56, DIN 79012)FG 2.3 Application Race/MTB/Down Hill Breaking Strength Spoke Tension According above datas and our client feedback, we find the PBA 1420 spokes are strong enough, and the weight is lightest, comparing to PBA 1425 spokes and PBA 1422 spokes. So we choose PBA 1420 spokes for wheelsets currently. Pillar psr x-tra 1420 spoke VS CN Aero424 spoke We have do some research on pillar 1420 spokes and CN 424 spoke these weeks. Both pillar 1420 spokes and CN 424 spokes are light, around 4.0g/pcs to 4.3g/pcs. But CN 424 spokes are much thinner and much cheaper（the price is only half of pillar 1420 spoke) , we have got some to test and if the spokes are ok, we can use it and make the wheelset price lower for customers. But while we build one wheelset, two pieces CN 424 spokes are broken. So, we decide not to use CN 424 spokes, still use pillar 1420 spokes. For pillar psr-xtra 1420 spokes,there are detail testing data on Pillar Spoke website like breaking strength, spoke tension breaking strength & spoke tension. But for CN 424 spokes, the data is not clear on CN Spoke website. Pillar PSR X-TRA 1420 spokes are really better than CN Aero424 spokes. We will keep on looking for better spokes with good price for customers,like DT super comp and Sapim CX-ray spokes. Sapim spokes are much expensive than pillar spokes, and we will try to contact the agent to get better price.
What is the difference for 3k, UD and 12k ? The main type of carbon fiber used for the manufacture of bicycle parts are normal tow (under 12000 fibers) carbon fiber, like T700, or commonly known as 3k, 12k weave, and UD(uni-direction) carbon fiber. carbon rim 3k 12k ud carbon fiber weave 3k carbon fiber weave 12k carbon fiber weave UD Bicycle components, specifically carbon frames & rims are made using various grades of carbon fiber characterized mainly by their tensile strength and tensile modulus. Tensile strength is the amount of force needed to cause the fibers to break, while the tensile modulus is a measure of the carbon fiber's stiffness. The cost of carbon fiber goes up with the increase in tensile strength, or increase in tensile modulus. And for carbon fiber weave also determines the cost of material with larger weave prepreg (eg.12k) costing less, due to the lower cost of manufacturing. Carbon fiber layer(prepreg) has maximum strength only along the lengths of the fibers. That is why almost all the inside prepreg are using uni-directional carbon fiber while making carbon rims & frames. But the inside layup charts are still not identical. For example, the orientation are different( some are placed at 0 degree, some are 45 degree, 90 degree). This is very important to make carbon rims & frames with good strength & performance. That is also why using uni-directional fiber instead of woven carbon fiber (eg. 3k, 12k) creates stronger frames & rims. Thus, the main use of woven carbon fiber is for appearance. But there is one mechanical benefit for 3k woven carbon fiber. Putting the 3k woven carbon fiber around hole area, it can prevent carbon fiber from laminating while machining holes. For the weight difference, woven fiber has some area pass across each other. So, woven fiber is heavier than UD fiber. But, for rims, the size of carbon fiber is not large and only one layer different, the weight difference of woven fiber (3k &12k) and UD fiber is not big. Also, all rims have a weight range, for rims, it is +/-15g. So, sometimes, 3k rims & frames are lighter than UD. For big size product (like frame), 3k frame will be heavier than UD. And for 12k, the weight different is not much difference. carbon rim weave 3k matte carbon rim weave 12k matte carbon rim weave UD matte For more clear pictures of weave 3K 12K UD , please click this link:http://www.flickr.com/photos/light-bicycle/sets/72157631432948364/detail/
There are a few customers like to know the benefit of 38mm vs 50mm carbon road bike rims. The shape is almost the same for carbon tubular/clincher 38mm rims & 50mm rims . They are both aero wheels/rims. The 38mm is lighter, but the 50mm is stiffer. The .38 have a bit faster jump and the .50 hold speed better. If you live in a pretty windy place, the 50mm could prove to be a bit much to handle in any sort of cross winds. But the differences are small between these two rims. Rim / wheel stiffness / spoke count & tension/air pressure/rider weight & rider skill does effect ride quality also. It depends a little bit on the conditions you'll usually encounter. If it tends to be gusty, even 38mm carbon rims may be a handful at times. If it's pretty calm, you may be OK with 50. Some would go with 38mm set if I could only take one wheel to a race / crit. They seem more manageable & therefore use-able in more conditions, therefore more bang for buck in the long run. Some buys a set of 50mm and a 38mm front. Ride 50mm on calm days and swap in the 38 if it is too windy. Ask yourself what kind of riding you do and how your current rims/wheels serve you and buy the rims/wheels that fill a need. Welcome to comment if you have any other suggestion. This will be good for all of us.
Carbon fiber rim is black. If you like your rims to be nice & special with your own graphic design, we can do decal stickers on rims accordingly. If you need any assistance in designing, we are glad to offer help. Otherwise, we offer FREE customed rim decals if you like your stickers on rim to be with words "Light-Bicycle". Any style are all OK. If you need any assistance in designing, please feel free to contact us. For more clear sample pictures of carbon rim customed decals, please click this link:http://www.flickr.com/photos/light-bicycle/sets/72157631704846817/detail/