FSA K Force brake calipers review.

FSA Full Speed Ahead Logo.I recently purchased a pair of FSA K-force dual pivot brake calipers. I hadn’t heard much about them and nobody seems to have them… anyway I have been very pleased with their performance over the last few weeks so I decided to write this quick review.

FSA K Force brake calipers review.Contrary to what other people have said about FSA products, I think these work brilliantly! I have found that both modulation and power are excellent. They’re on par with another set of highly-rated dual-pivot brake calipers: Mavic SSC. They feel stronger overall than shimano ultegra calipers, possibly due to the I-beam shape of the arms. I can’t be 100% sure of that, because I’ve been testing the new vertebrae ceramic brake housing (also pictured). [Read more →]

Continental Ultra Sport Tyres – review

Continental Ultra Sport Tyres -Review.One of the consumable parts which I go through more than most are road bicycle tyres. There are 12 road bikes in my fleet and I own two more myself. That’s a lot of tyres being constantly used, so I have a pretty good idea of how to choose a tyre for maximum duration & performance…

I discovered the Continental Ultra Sport model earlier this year. In a word, they’re excellent. [Read more →]

Another seatpost recommendation…

Da Bomb seatpost the mortar review.This seatpost by DaBomb comes in the following seat tube diameters: 27.2, 30.0, 31.4, 31.6. I was forced into buying the 30.0mm size because of a recent Viper frame I bought. Nevertheless, I was very suprised by the simplicity of the clamp mechanism. If you swap saddles regularly or get easily peeved doing so, this is the one post for you. [Read more →]

Types of bicycle pedals & shoe compatibility guide

Types of clipless bicycle pedals & compatibility guide.If there’s one thing that causes beginner cyclists anxiety, it’s the overwhelming choice of pedals that are currently available, so I thought I’d write this article about the types of road and MTB pedals and their compatibility in the hopes that someone could learn something from it.

First things first, the good news is that 98% of the pedals you can buy today are interchangeable with standard bicycle cranks. They prety much all use the 9/16″ x 20 tpi (threads per inch). That means you can swap the pedals on everything from a 5 year old childrens bike to a top of the line road racer or downhill bike. [Read more →]

What gives metals their strength?

What gives metals their strength?Doc Brown ~

I ran across your column in my quest to find out more about bicycle frame materials (aluminum, steel, titanium, carbon fiber) on a molecular level. I am a 7th grade teacher and i am putting together a unit about the Science of Cycling. I want my students to understand why these different materials have the properties they do on a molecular level. Why is titanium so strong? Is it that all of the particles are so clumped together? I dont know if that makes complete sense but i am trying to grasp why these materials have these certain characteristics and if we looked at a particle level, what would it look like?

Can you help me??
Thanks!


Common close packed structures.Metallic Atomic Structure:
All metals have a crystalline structure made up of “close packed” atoms. The atomic nuclei are in fixed positions while the electrons can migrate. This gives metals their ability to conduct heat and electricity well. The crystal arrangements are better represented by spheres in what’s called a unit cell. There are three main types of packing in the transition metals: Face-Centred Cubic (FCC), Body-Centred Cubic (BCC) and Hexagonal Close Packed (HCP). The packing densities of BCC, FCC and HCP structures are 68, 74 and 74% respectively. The size of the nuclei vary according to the type of element.

Growth of grains in a metal during nucleation & solidification.Metallic Microstructure:
The atoms in a metallic solid are arranged in close packed crystalline arrangements. However, during solidifaction of a molten metal, different regions are forced to crystallise at the same time. This gives rise to various “grains”. Within each grain, the atoms are arranged regularly; it is the spatial orientation of this ordered array that differs between these grains. The sizes of grains normally vary from microns to inches. Grains can be seen with the naked eye in galvanized metal sheet (zinc plated steel), but they are usually microscopic. Generally speaking, the faster the cooling process, the smaller the grain size. Grains are also highly dependent on the forming processes involved in manufacturing a metal. A smaller grain size increases strength on the premise that it is difficult for dislocations to cross grain boundaries. [Read more →]