The_Break

No, I just need to do some testing on them.

Hi I don't like dissing products, but I would like to say the following as it is not nice when you spend a lot of cash and maybe get disappointed. Not that you will, but here is what I have heard from actual good mates of mine. Mate 1: Bought the 2nd top Solis frame, picked up major speed wobble during a race, struggled with bike for a while but wobbles persisted. LBS gave him a new frame and the same thing happened. Only with the 3rd frame which was now upgraded did the wobbles go away. He is one of the best cyclists in our area. Mate 2: Bought a Solis after a major wipe with her old bike. Found the bike to be a bit shacky and didn't handle to well on desents according to mate 2. Then borrowed a friends Orbea Orca and had no problems. Eventually rode Solis again and then decided to return bike to shop and has now bought a Scott Addict. Had a feel around the fork and head tube and must say the carbon does not feel as solid as other bikes like cervelo, scott, giant, orbea. Maybe it is not as stiff as these other bikes and thus gives the wobbles. Many people may disagree with me, but I have seen my fair share of bikes and even Cervelo now conduct a test they consider to be a way of checking the handling of a bike, they check the stiffness of the headtube as they say if it is stiff the bike will stay "true" in corners. I.e. front fork will not bend out as much and wheels will stay more or les"s where they are if no distortion takes place. Anyway, don't want to break the product down, but want you to have a chance to check out if what I am saying is maybe true and then you can decide for yourself and be happy with what you bought with your hard earned money.

Anyone know where I can get a set of those?

Agreed regarding wetlube in dry conditions on a mountain bike. Dust and grit will stick to any "wet oily" product. I ride a road bike so it makes it much easier. Not much dust around like in the bush. Guess then wax may be the best for a mountain bike as it is "dry" and not sticky like oil.

Any chain will stretch out long before it wears down enough to break. When it comes to wear it is the gears you need to worry about. Personally I use wet lube. It is easier to clean as you just wipe it off after each ride and reapply and in this way your drivetrain stays generally clean. If you are riding big miles then this may be the best.

See, even an expat living in Estonia is rooting for the girls.

I think this forum is starting to speed wobble or is it just an earthquake here in China???

oops, that's k * dx and not x. Still want my discount at the Lab.

Well, at least you have increased k then. Should stabilize your bike a bit.

c < 1? Mmmmmm dF = m * (dx/dt)^2 + c * dx/dt + kx Yes, ok, I agree then. She needs to put on about 2.3573418kg and she will get a speed wobble. That is assuming she is riding Conti Comp and a spoke on her rear wheel is 3% under tension.

Now that is a very interesting topic. Your "wobbles" should actually act like dampers. Maybe that is why your bike doesn't get speed wobbles. What do you say Johan? (come on, be a sport and joke a bit... )

Then all is fair. A worthy opponent, when I feel like a debate. Luckily that is very seldom.

Oh right. Well that gives me new insight then. Thanks! An expert is normally the term given to someone who really knows a hell of a lot, including the truth, about a subject and is given this title by others who are either an expert themselves or close to it. So I must ask the question: Is he an expert by public opinion?

So what's his claim to fame then?

Johan Bornman reminds me of the movie, Cliff Hanger! He just never let's go.

Here's an idea. Why not have a Forum heading? B#tch fights and slapping!!! Then any forum that degenerates gets put into that section. In this way, the person who started the forum looses the original intent cause the more serious people on the Hub won't go and look at the forum. Those that go and read the forum will do it for fun and then we can all have a laugh. Must say, I actually enjoy listening to how people get so upset about things that actually, at the end of the day, don't affect them at all. Amazing characteristic of man it is!!!!

Here's my 2 Zimbabwian cents worth. You kow who Sernoche1 reminds me of? He reminds me of the Cofidis organization that Lance talks about in his first book, It's not about the bike. Sure most of you have read it, but for those who didn't, when he got diagnosed with cancer they wrote him off and practically wanted to pull out of their contract with him because they thought he would never amount to much in the world of cycling again. Actually, nearly everyone wrote him off. Look what he did. Everyone needs to start where they are at and it is only with opportunity and hard work that you can go to the top. Without opportunity these girls will never reach the top, but now they have it so anything is possible. At the very least they will gain some experience and that it priceless. As to whether we should vote Sernoche off. No, he also deserves an opportunity to learn and to grow and I am sure this experience will be a priceless one for him.

Johan You can call it a copout if you like. I will even tell you that you win this one ok? I haven't been around long enough on this site, but it seems that no matter how much someone explains something to a person like you, you will keep on pressing the issue and trying to look like you are right. What's worse is the way you do it. You never debated, but attacked from the start. I don't like arguing about silly things. Wolverine is sorted. I was just trying to diagnose Wolverines problems and then answer some questions that came along with it from other hubbers. I am not trying to prove anything. If I was insecure about my knowledge of engineering then my business would have failed a long time ago. I think the bigger questions is, do you have internal friction pushing you back in life?

Hey Johan No more debating or explainations. I don't expect you to understand, it really needs a big base of maths and science to understand fully. No need for me to explain. I wouldn't tell you how to build a wheel unless I had designed the thing, it is not my area of expertise, so I don't expect you to understand what I am getting at, that is my area of expertise. Anyway, let's just call it quits and have a good laugh at our egos. Luckily Wolverine's problems are long gone.

Hi Christie You are right and you are not right. Rotating parts are always accelerating as they accelerate in order to change direction as they rotate if that makes sense. Force = mass * acceleration and hence you need to keep applying a force in order to keep the mass rotating. You are right in that the rotating part is not speeding up though, but parts are changing direction and thus accelerating in order to do this. Linear motion has an energy of E = 1/2m *v^2. Rotating motion has a similar equation I can't remember. Will have a look for it. The Vuma quads are sweet though hey. Already got myself the Look Keo Ti 95g. They are nice as their cleats pedal combined weight is I think a bit lower than that of the sppedplay pedals.

Hi Johan Newtons 3rd Law of motion. If you do draw a force diagram of all the external forces acting on the bike you will see what I mean. Also, if you knew your friction equations you would know that there are 2 types of friction, static and dynamic friction. We use static here. What's more draw your moment diagrams and then you can integrate using this information and you should come up with a stress equation which will tell you that the fork indeed flexes backward and your wheelbase shortens. As mentioned in one of the replies as well. Then if you take a look a stability equations and vibration and harmonics you may just understand. But I sure hope you know your 12 Maxwell equations cause without them you may never understand. I could explain all the theory, but it seems you are the oricle of science on this site so I will leave it up to you to explain what I mean to everyone. What do you guys say???? Should we make him explain??? And I sure hope you have more than matric science cause you are going to need it if you go around acting like you know everything and then at the same time insult people in flame suits who are wearing them because they spent 5 years studying the same stuff they are hulicinating about and got them at their graduation ceremony. Luckily my current space suit is a new version. I got it after many years of service in the design industry and boy you should she the kind of heat it held up to during all the project we put out into society across the globe. However, I could be wrong about what I know, and if I am and if that is what our countries engineers are learning at University then I sure hope they get the curriculum sorted out.

Hi Johan I think you need to study Newtons laws again and then reread my comments as well as your comments about my comments. You may just find yourself a little embarrassed.

See you boys and girls been thrashing it out. I like it!!! Ok, Craig, you are right, I knew that but few people do. Reciprocating parts use twice as much energy to keep travelling at a constant speed due to the energy it takes to keep it moving in a straight line as well as the energy it takes to rotate it. Will check out the equation tomorrow in one of my books. Ok, all in all you have gotten nearly the same answer I did. Aero is nearly always better as this is the greatest components of force most of the time. When it comes to weight, which does make a big enough difference for those 2kg to be enough for you to get dropped from the group, it is best to take weight off of rotating components rather than non-rotating. Stiffness is important because it makes your pedal to wheel efficiency better and makes for better handling and rolling resistance should be reduced by better tyres, bearings and a clean chain. So to answer the original question, a frame is too light, when your bike weighs 6.8kg and you can still find the money and reciprocating parts that will make it even lighter. Now, where did I put that Vumaquad BB tool?..........

Only when my insurance company opens its vault, give the secret code to the four armed guards and tranquilizes the 16 rottweilers. I normally get an armed escort with air support.

Ok, real life scenario. Cervelo Soloist carbon frame, fork and seatpost (frame heavy in comp to lightest frames), full dura ace groupset, campy bora ultra wheelset (1305g - tubbies naturally), campy competition tubbies, selle san marco aspide fx saddle (180g), ITM wingshape handle bars, ITM stem, carbon bottle cages (40g), Shimano magnesium pedals (182.5g per pedal). Full bike mass = 7.35kg. Everyone told me to buy a lighter frame. After all my research I found that having the heavy frame was actually a blessing as I could get down to 6.8kg by spending R13,000. Cheaper than any frame that could knock that mass off and I will get some very cool technology on the bike that gave me free speed and the mass was taken off in areas that actually was the equivalent of taking about 900g off of the frame. That is big. Added to this I get to keep the aerodynamic advantages as well as the super stiffness that helps climbing, sprinting and good handling.