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mtnbykr05 paulaston's article
Jul 30, 2015 at 9:47Jul 30, 2015
Orbea Loki 2016: First Look
Ctd07, There are two types of rolling resistance; contact patch that affects acceleration and deflection that affects momentum. Contact patch has to do with the amount of rubber in contact with the ground when the object is weighted and in contact with the ground. Deflection has to do with the amount your tire absorbs the terrain as as it is coming at you. The more you increase your tire pressure the less contact patch you have. This is why when you inflate your tires to high pressures the amount of effort it takes to get the wheel rolling is lower because you have less rubber resisting against you. However, with higher pressures when you hit an object, your tire is more likely to deflect of off the object rather than rolling through the object. This is added resistance as well because it slows you down and takes more effort to keep your momentum up and your tires rolling. The most correlative would be road cycling. In track, they run 21-22c tires and of 140psi and sometimes 150 or 160psi. They can do this because the surface of the track is extremely smooth, and less rubber contact WILL be faster. Now, for an outdoor race, they tend to run 23-25c tires, with the latter now being more popular, and pressures in the 90-120psi range, depending on conditions. A rider in the Paris-Roubaix will likely run on the lower side of the pressures to smooth out to rough and to prevent him from running off course. This can all be applied to mountain bikes as well. You tend to find XC folk running smaller tires to decrease contact patch, but usually run pressures in the high-teens to low twenties. This is not only to increase traction, but to smooth out the trail making their effort go further. Also why a large amount of riders now ride tubeless. To increase traction, lessen pinch flats, but most of all create a smoother ride. No longer to you have the added stiffness of a tube AND a tire. Now there is just a tire that falls between the stiffness and thickness of a tire/tube combo. With tubes, I used to have to run my pressure in the mid-thirties to prevent a flat. Now running tubeless I can run in the range of 25-30psi. The few instances I have had to run a tube because of a sliced tire on a tubeless set-up, I immediately noticed to increased effort to keep the tire rolling and tracking straight. This resulted in more fatigue and soreness in my lower back from the increase in strength to keep the bike in line, and from the added jolt through the tires. http://triathlete-europe.competitor.com/2011/05/03/facts-figures-myths-optimum-tyre-pressure
Added 2 photos to Selling
Jul 27, 2015 at 16:51Jul 27, 2015
Jul 27, 2015 at 16:50Jul 27, 2015
For sale is a RockShox Reverb, 380mm length, 125mm drop, 30.9, externally routed. Hose measures to be 124.5cm / 49in in length. Lever is for the right side of the bar, but I ran it under the bar on the left in place of a shifter (if running a 1x). I purchased the post second hand from a shop after being returned because the original owner didn't know how to bleed it for regular maintenance. After a quick bleed it was working like new. I have had the post for approximately the last 8 months and have bled it once since the first bleed. It is in excellent condition. No scratches on the stantion, hose in great shape, and only an "X" marked into the body of the post from the shop I purchased it from. PayPal if shipped or Cash-in-hand w/ Direct Pick-up only. Buyer pays shipping. Will ship to USA and Canada only. Asking $180. REASONABLE offers only, so please send me YOUR offer.
Added 2 photos to Selling
Jul 27, 2015 at 15:42Jul 27, 2015
Jul 27, 2015 at 15:41Jul 27, 2015
For sale is a Shimano XT 10 speed shifter w/ I-Spec mount. Has all the needed mounting hardware, is in good working shape, no excess play or wear. Light cosmetic scratches from running it close to the brake. Mid-use I opened it up, cleaned it thoroughly and re-lubed any moving parts. Asking $30. NO TRADES, REASONABLE offers only, so please send me YOUR offers. PayPal if shipped or Cash-in-hand w/ Direct Pick-up only. Buyer pays shipping @ approximately 1-2lbs. Will ship to USA or Canada only. *Does not come w/ cable*
Added 15 photos to Selling
Jul 27, 2015 at 15:25Jul 27, 2015
Jul 27, 2015 at 15:25Jul 27, 2015
For sale is a Truvativ Hussefelt crankset w/ a 24-36t-Bash. 175mm in length, 73mm spindle. Comes with the Howitzer Team DH BB. I had this on an older build from 2008-2009. It saw little use before I dismantled and sold the frame it was built on and has been sitting in my parts box ever since. There are light scratches on the base of the arms and a little bit of foot wear on the arms. BB still runs smooth. Pedals threads in excellent shape. PayPal if shipped or Cash-in-hand w/ Direct Pick-up only. Asking $50. Reasonable offers only, so please send me YOUR offer. NO TRADES. Buyer pays shipping. Will ship to USA and Canada @ ~5lbs.
Jul 27, 2015 at 15:17Jul 27, 2015
For sale is a Truvativ Descendant crank w/ a 73mm spindle in 165mm length. I added this to my downhill bike for a very short period of time before building a new frame requiring a wider spindle. Crank is in excellent shape aside from 2 scratches. One at the top of the non-drive crank near the spindle and another at the base of the drive-side arm. There is little to no foot wear on either of the arms. All ring-mounting arms / spider arms are straight and free of any damage. Threads are also in excellent condition. Asking $80. This price is fairly firm but taking REASONABLE offers. NO TRADES. So please, send me YOUR offer. PayPal if shipped or Cash-in-hand w/ Direct Pick-up ONLY. Buyer pays shipping at ~5lbs, UPS Ground or other. Will ship to USA or Canada only.
Jul 27, 2015 at 15:06Jul 27, 2015
I'm selling my On One 456 EVO II 26" Frame in Large, in a clear coated Raw / Blue color. I built the frame up last summer as a commuter / long-distance / pseudo-XC bike, ridden heavily, and has been disassembled for the last 4 months. There are a handful of light scratches throughout, and the only gouge/deep scratch is near the BB on the chainstay from a single instance of chain-suck. There are 2 or 3 small dents on the downtube from shuttling over a tailgate (with tailgate pad). Has ISCG mounts, 30.9 seatpost, 1 1/8" straight steerer tube, 135mm QR dropouts, 73mm English Threaded Bottom Bracket. When the frame was new, before installing the BB, I did chase the threads to make sure of proper BB installation. It is ideal for a 120mm - 150mm fork. I personally found it rode best with a 140mm. I have added 3M tape to the chainstay and lower seat-stay to prevent from chain-slap damage. Included is a Cane Creek 40s headset for a straight 1 1/8" steerer tube valued at $50 and a seat collar (not pictured). This frame is great for all those older 26" parts you have lying around or that are available really cheap through online sites that are on close-out or right here in PinkBike's buy/sell. The slacker head angle is well suited for steep terrain, but it's short chainstays make for a really snappy / peppy playful bike. I had a lot of fun on this bike, and could smoke people up-and-down on a longer travel or light-weight XC bikes. My only reason for selling is to get additional cash to part together a longer-travel Enduro / Do-All bike. No Trades. I am asking $200, REASONABLE offers only, please send me YOUR offer. PayPal if shipped or Cash-in-hand w/ Direct Pick-up only. BUYER PAYS SHIPPING @ ~15lbs UPS Ground.
Added 10 photos to Selling
Jul 27, 2015 at 13:27Jul 27, 2015
Photo by yeticycles
- Truvativ Descendant 73mm 165mm Crank/Bottom Brackets 80 USD
- On One EVO 456 II 26" Large Raw / Blue Frame XC/All Mountain Frames 250 USD
- Truvativ Hussefelt Crankset 24-36t-Bash 175mm w/ BB Crank/Bottom Brackets 50 USD
- Shimano XT Shifter 10 speed I-Spec Right Shifters/Derailleurs 30 USD
- Specialized Stumpjumper Expert EVO 650 - BRAND NEW XC/All Mountain Frames 1,750 USD