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2013 trek Gary fisher stache 8
Frame platinum aluminum
Fork fox 120 ctd
Crank xt 175 length
Derailleur xt shadow plus with clutch
Xt front derailleur
Seat post pro koryak
Brakes slx hydraulic disc
Shifter levers slx
Stem pro koryak
Bars bontrager low rise
Bontrager evoke saddle
Wheelset bontrager duster tlr
Tires bontrager xr3 tires
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More petro-dollars are pouring into cycling, this time via the Emirates with the debut Tour of Dubai set for February 5-8.
Dubai officials unveiled Tuesday its four-stage route, with an opening time trial and three road stages. Among confirmed starters include world champion Rui Costa (Lampre-Merida), Fabian Cancellara (Trek Factory Team), Mark Cavendish (Omega Pharma-Quick Step), Marcel Kittel (Argos-Shimano), Peter Sagan (Cannondale), and Joaquim Rodríguez (Katusha).
In total, 16 teams of eight-rider squads will line up in Dubai for what is the third major early season race to take root in the Persian Gulf region.
The field will include 11 UCI ProTeams, three of the top-ranked teams in the Asia Tour, as well as the United Arab Emirates national squad and the upstart continental Dubai Sky Dive team, which has been making noise about aiming for the UCI WorldTour within the next few years.
As can be expected for these types of events flowing in the oil-rich Gulf region, everything should be top-shelf, both in terms of infrastructure, accommodation, and production. Officials are underwriting a TV broadcast that will be beamed out live to the major cycling markets.
Following on the heels of the successful races in the Gulf region, with the Tour of Qatar and the Tour of Oman, both organized by Amaury Sports Organisation, the Emirates didn’t want to be left out.
RCS Sport, which organizes the Giro d’Italia and the other major Italian races, didn’t want to be left out, either.
The race began to take root a few years ago, when the Emirates approached Giro officials about starting the “corsa rosa” in Dubai. They countered that it would be a better long-term investment to create an annual race rather than a one-off event.
Regional powers are using cycling as part of an aggressive effort to establish the Gulf region as a hub for international sport. Qatar already secured rights to host the 2022 World Cup and there is growing momentum to host what would be the first Olympic Games for the Arab world.
On Tuesday, officials used the spectacular Royal Mirage, the headquarters for the 2010 World Expo, as the backdrop for Tuesday’s official race presentation.
With four stages, each day will start at the Dubai World Trade Center. Stage 1 will be a 10-kilometer individual time trial through the streets of central Dubai.
The 122km stage 2 will traverse the central sporting facilities in Dubai, including a golf course, a horse racetrack, the Formula One course, and an Olympic pool.
The 166km third stage, the longest of the four, will leave the urban center and finish after rolling across the desert country to Hatta.
The 124km final stage will pass two of Dubai’s most emblematic buildings — the Burj Al Arab hotel complex and the Burj Khalifa, the world’s tallest building at 830 meters — before ending in “old Dubai.”
Inter-brand combos for hydraulic brakes
With hydraulic road brakes becoming more mainstream, what do we know about compatibility and possible inter-brand combinations?
I’m thinking specifically at the moment of the feasibility of mating the new Shimano ST-R785 DI2 levers with SRAM Hydro rim calipers, since Shimano doesn’t offer a rim caliper yet. It’s a common practice in motorcycle racing to mix and match different brand master/slave cylinders, but the lever/caliper piston areas, and thus relative pressure ratios, need to be in sync to give proper feel and power for the application.
My local dealer says the SRAM hydro levers are the same for the disc or the rim calipers, and the RED disc caliper piston sizes are listed as 19mm/18mm, front and rear, respectively. So if that is the target caliper piston size, — it seems the questions to answer would be: What are the Shimano BR-R785 road disc piston sizes? Are the Shimano lines compatible size-wise with the SRAM calipers? Are the two fluid-compatible?
Time to put your mad scientist hat on and cobble together some Frankenstein hydro brakes!
Don’t do it!!!!!
Even if the threaded parts were compatible, the issue is the fluid (i.e., the answer to your third question is no, thus negating any discussion of the first two questions). Shimano brakes use mineral oil, while SRAM brakes use DOT fluid. The two are not compatible and will cause failure, cracking, or swelling of seals intended for the other brand’s fluid.
There is a rumor that SRAM is considering offering some mineral-oil brakes, since some customers, presumably ones who are used to Shimano and Magura brakes, are requesting it.
Installing disc brake pads
Like Brian, I had great difficulty putting new pads in my Elixirs. I felt like I needed a crowbar to open up the pistons. I finally ended up doing what was suggested in the Art’s Cyclery video on installing disc brake pads, which is to wind out the pad adjuster and open up the bleed port. With the Elixirs I always do a lever bleed after putting in new pads anyhow, so there is no penalty if I lose a little fluid, but more often than not I just end up bleeding out a little air.
I really had no luck spreading the calipers on my Elixirs for the past four years, so I would always end up opening the bleed port to put in new pads. But when I was changing a rotor and pads this past weekend, I decided to give it another go (your post inspired me) — just spreading the calipers. I used a pretty good size flat blade screwdriver and levered against the old pads.
To my surprise, this time it worked perfectly. I couldn’t believe it when the pads just moved right out and stayed there. I wonder if it’s because it has been four months since my last bleed, so there was enough air in the lever to accommodate the extra fluid. Whatever the reason, I can no longer say it’s never worked for me to just spread the calipers.
Follow-up to countersteering
Regarding Pierre’s doubt as to the reality of countersteering, there’s an easy way to prove to someone what’s happening. Just take the front wheel off the bike, give it a spin, and try to point it to the right, then watch the person’s face in amazement as the wheel leans left!
Thanks. I should have mentioned that. I have loved this demonstration ever since seeing it in an angular-momentum demo in freshman physics class!
More on high-speed shimmy
Years ago I failed at finding any article that helped explain the phenomenon of high-speed shimmy. Truly drove me nuts. And although your most recent article is fascinating (even for average roadie enthusiast), I still didn’t find information that would help advise me of how to prevent it. Of course that wasn’t the purpose of the article, but just the same … anyone who has experienced it definitely doesn’t want to repeat it. And while they experience it, they immediately want to know how to get out of it.
After reading the article it basically sounded like frames have a shimmy threshold based on rigidity. Which is great, let’s get them labeled as such (kidding), but I truly believe a correct bike fit is the missing parameter in the analysis of what makes the bike shake, or what prevents it from shaking on the first place.
I first experienced the shimmy at 42 mph while seated upright on my carbon/aluminum frame. Braking only seemed to make it worse, so somehow I managed to ride it out to a lesser speed at the bottom of the hill, and survived intact, though mentally I was a mess.
Even after upgrading to an all-carbon bike, I still had shimmy (albeit less of it) and would apply all the tricks I gleaned (keep one pedal low, weight on handlebar drops, one knee pressed on top tube). I had some upper-end bike fits done, but the bike still shimmied.
Until I found one guy that really knew what he was doing. He adjusted everything. And sitting there in my new cockpit I felt for the first time what it was like to have weight on my front handlebars naturally, as opposed to forcing my weight on them. The feeling of being on a platform with my legs as pistons was unreal, and that was just in the fitting room.
I tested my new fit on the zippy, crosswind-riddled route down from the Golden Gate Bridge — a personal shimmy nemesis of mine. And to my surprise, my bike provided a stable platform throughout the entire descent.
So although a stiff frame definitely helps, the correct fit in my experience is also vital to get rid of the shimmy for good.
Anyways, just thought I’d share in hopes of helping any other enthusiasts out there who continue to struggle with the shimmy.
Reading professor Bollt’s explanation of speed wobble brought me back to this past July. I crossed the threshold of my frame/wheel stability. I thought it was a combination of using different rims (bladed spokes versus rounded), wind buffeting from a steady stream of vehicles on my left, and diagonal cracks in the pavement. I had felt a shimmy once or twice before on that bike and had the wheels checked for true because I thought that might have caused it. This time I did feel the “weave” and oscillations beginning at about 31 mph, and then by 35 mph I knew I had to slow down or wreck. Then I hit one of those cracks (or a chunk of broken pavement) and got launched.
After my lab experiment, his explanation of speed shimmy makes sense. I also disproved my theory that I could stop the shimmy with my knees gripping the top tube and that the shimmy would stabilize at some point (like breaking the sound barrier). I will keep that bike under 30 mph to be safe.
In an attempt to end this once and for all, I bought a Ridley Excalibur with its huge rigid fork and a 1.5-inch lower steerer bearing.
In my case, the bike was not the problem. I don’t do that much high-speed descending anymore and have gotten rusty. Going downhill where I need a lot of lean, I tend to get nervous, not lean over far enough, and then my arms start to shake, out of fear. Then the bike starts to shake. And it keeps shaking — one memorable time even as I slowed down to a very low speed.
I have been experimenting with this by taking a particular curve at a speed that is just barely above my comfort zone, so that it is easy to recover.
The bike and rider system is much more complex than a bridge or an airplane wing because of how the human body responds to fear. However, I am not saying that what I experienced is the only thing that could cause shimmy.
Countersteering really helps to keep things under control on fast downhills. Control the line by controlling the lean. Countersteering has nothing to do with the front wheel pointing opposite the direction of motion. That is a misunderstanding of the concept.
Oddly enough, my old Cannondale ST-500 seems to be a much more stable and forgiving dive bomber than the Ridley.
I just read your VeloNews letter from the math professor about high-speed shimmy.
Almost everyone who attempts to analyze this subject fails to take into account that bike wheels are grossly out of balance. Yes, just like a car or motorcycle wheel, bike wheels, with their protruding valve stems and other issues, are often wildly out of balance. Spin any wheel and there will be a “heavy” point that, after the wheel is done spinning (off the ground), will end up at the bottom.
Please take into account that most cyclists are completely unaware of how much their bicycle wheels are out of balance, and that this is a major factor in high-speed shimmy. Bike wheels need to be balanced just as with any other wheel! Whether taped-on weights or otherwise, they need to run in balance.
Thanks for mentioning that. I actually went into this years ago and recommended stacking up threaded valve collars on the valve stem until the wheel had no preferred place where it stopped its rotation. And I remember highlighting this feature in an article I did on visiting ADA wheels in Holland. ADA founder Cees Beers built in a weight with an embedded microchip into the wheels to not only record production information but also to balance the wheel.
Have been an avid fan of your thoughts and advice for a very long time … the most recent VeloNews bit on tank slappers was excellent. Now in my 50s, I’ve been a bike racer since my teens and also successfully road raced motorcycles … and have encountered the dreaded speed wobble/tank slapper a few times. The whole discussion reminded me of a terrific video that I hope you’ll find entertaining as well as informative on the subject. I hope you enjoy it.
The post Technical FAQ: Hydraulic brakes, high-speed shimmy, and more appeared first on VeloNews.com.
MILAN (VN) — Oleg Tinkov, the new team owner of Tinkoff-Saxo, made amends with star rider Alberto Contador over his Twitter comments. The Russian said that he was just trying to provoke Contador by writing that he was overpaid, not professional enough, and lacked desire.
“He had some issues but of course, he understands that it was just a provocation,” Tinkov told VeloNews. “I’m passionate about this sport and sometimes, I was just maybe a little bit over [board] but it’s not a big deal.”
Tinkov created a stir on his Twitter account, @olegtinkov, when he wrote about Contador’s Tour de France performance over the summer. Contador, a two-time winner of the race, placed fourth behind Chris Froome (Sky) this year. In terms of wins, it was his worst season since his debut year in 2013. He won once, a stage in the Tour de San Luis in Argentina.
A day after the Tour, July 22, Tinkov took to Twitter:
“Conta performance wasn’t good. He need to change many things in his preparation and be more PRO. Will he do that? That’s the question…”
“His salary doesn’t match his performance. Too rich and isn’t hungry, that’s my opinion, and I deserve it. He must work harder”
Tinkov told VeloNews that he “considered” pulling his sponsorship, an estimated 6 million euros, for the 2014 season and that he shopped for other teams. Instead, he said that he “simply bought the team.”
At a press conference last week in London, Tinkov announced that he purchased the Danish, first division team from 1997 Tour winner Bjarne Riis. He hired Riis to manage the team.
“Now the team is going to be called Tinkoff Credit Systems-Saxo. Tinkoff Credit Systems, the full name, is going to be back on the jersey,” added Tinkov. “The jersey will be dominated by yellow.”
Tinkov said that he and Riis made no deal about what he is able to write on Twitter. At the press conference, Contador explained that he dismissed the comments.
“Whatever happened immediately after the Tour,” Contador said, “is long behind us.”
“I don’t know if Alberto understands it or not. I haven’t discussed it with him. I don’t think he’s looking at social media so much,” Tinkov told VeloNews. “We have no issues, as you saw at the London press conference.”
Tinkov said the pair had time to talk about the upcoming season and the new ownership while riding together for three days in Spain. He explained that he has full faith in the 31-year-old from Madrid’s outskirts.
“Alberto is the only rider capable of beating Chris Froome,” Tinkov said.
The post Tinkov: Criticism of Contador on Twitter went too far appeared first on VeloNews.com.