The brakes on your bicycle are used to control the speed of your wheels, so you can maintain control of the bicycle. Having brakes that work properly is very, very important. Please do not use this entry as a substitute for a bike mechanic with knowledge of your brakes. That could be dangerous.
So….brakes help you control the speed of your wheels to help you maintain control of your bicycle. In this entry I will discuss the how and why of The Pedal Wrench brake set up. The goal is to achieve efficient and effective brake control over the course of the ride.
Before we go into the brake set up, I feel I should mention braking technique. Brakes are designed to perform best when used certain ways, and remember, control is what it’s all about. Think about when a cyclist may use the brakes on their bicycle. I mean really, really use them, depending on them to work best when the consequences are the highest. For a road cyclist it may be right in the middle of the peleton, or perhaps a rain soaked descent with heavy traffic. The mountain biker may run in to the loose gravel turn with sudden drop just beside it, or the slippery roots of a technical downhill. In these situations, control is key to staying upright and safe.
The more fingers wrapped around the handlebars while braking, the stronger the main connection to the bicycle will be. If you are using 3 or 4 fingers to squeeze the brakes, you are barely holding on to the handlebars. Most modern brake levers are designed around a 2 finger brake technique, but 1 finger braking works as well.
In the case of the road bike with drop handlebars, the rider’s hand position on the bars is crucial. Riding on top of the brakes, or on the brake hoods, allows access to the brakes but with little control of the brakes or the bike. While riding on the brake hoods is a comfortable way to get around, it is not the position the brakes were designed to be used from. To get the most from road brake levers, a rider must get used to descending in the drop position on the handlebars. I can’t emphasize how important this is for roadies. You’ll understand more shortly.
Brake lever clamps move on 2 axes to the handlebars. Getting the position correct will help cut down on rider fatigue, making it easier to brake longer into the ride. Archimedes said “Give me a lever long enough and a fulcrum on which to place it, and I shall move the world.”. We don’t need to move the world, but having a nice mechanical advantage is great. This is the idea behind the first of these adjustments. We want to use the brake lever as it was intended, as a lever, and the longer the better. The other adjustment will make the brake lever less of a strain on joints and muscles.
The bar tape on road bikes makes adjusting the lever position a bit more of a task. Having faith in the mechanic that built the bike is usually acceptable in this case, but I’ll go over some general guidelines for road bike brake lever position. The brake lever hood and handlebar will create a broad area for your hand to rest. The brake hood forms a continuation of the part of the bar that runs parallel to the ground, forward of the 90 degree bend, and just above where the bar drops to towards the ground. As the rider’s hand grasps the bars in the drops, the bottom of the brake lever blade should be in easy reach of the 2 braking fingers. If the rider has to drop their shoulder more than a little to reach up to the lever blade, the lever may be mounted too high, or the angle of the handlebars could be off. Once the height is set, the hoods tend to be more comfortable when they are adjusted just in of straight forward.
Fortunately, mountain bike brake levers are easier to adjust. I say fortunately because most of the time having faith in the bike mechanic doesn’t work out so well in regards to this. Most mountain bikes will come with what I call “showroom brakes”. “Showroom brakes” are made to be aesthetically pleasing, not so functional. In order to get the proper placement on the handlebar, the shifter may have to be moved in towards the center of the bar. A common mistake bike mechanics will make when building a bike is overlapping the shifters and the grips. The creates an unusable part of the grip, unless you have Grip Shift. The shift levers need to be within reach, but should not take up usable space on the grip. Once the shifters are out of the way it’s time to adjust the brake lever. The lever should sit in a way that the 2 brake fingers easily reach the end of the brake lever. Remember, we want to squeeze the lever at the point furthest from the fulcrum or pivot to gain the most mechanical advantage. The next adjustment is one I constantly change. The angle of the lever in relation to the rider’s hand and forearm should be set for the cyclist’s comfortable descending position. Adjusting the lever to be in line with the forearm works well, but riding positions change depending on the terrain. To accommodate the change, leave the brake lever clamp tightened to the point where the clamp spins on the bar when forced. This will allow for adjustment while riding and it also allows the brake lever to move instead of snap off, should the bike hit the ground. If the lever moves under the normal forces of riding, it is too loose.
Now the lever is mounted in the proper place on the handlebars. The next adjustment to consider is the reach of the lever blade. “Reach” is the distance between the bar and the lever blade. Not all brakes have this adjustment, but many will. Road bike levers can sometimes use wedge shims to move the starting point of the lever blade closer to the handlebar. These reach adjustments may affect the tightness of the brakes which is why I’ll discuss that adjustment last. The reach should be set so the braking fingers can quickly and easily contact the lever blade. Obviously cyclists with smaller hands and shorter fingers will have the reach set closer to the bar.
The last part of this bicycle brake set up theory is the hardest to swallow for most. The brake lever is set in position, now we adjust the “throw” of the lever. “Throw” is used to describe the amount of change from the starting point of the lever blade to the lever blade under “full squeeze”. “Full squeeze” is relative to each specific brake. Flex and compression in a brake can allow the lever to pull beyond the usable brake squeeze. The “full squeeze” would be the point in the lever’s travel at which the wheel would have a tendency to skid.
The closer to the handlebar the lever squeezes, the more brake and bike control is gained. Here’s why, The more a rider’s finger wraps around the brake lever the more muscles are used in the act of squeezing. If 10 muscle groups are squeezing instead of 3, that would be an advantage. This is also important when thinking about control of the bike. As the lever gets closer to the grip it acts as a handle to grasp. Instead of holding on with 2 fingers, now the rider is able to hold firmly with all 4 fingers. The lever becomes a useful tool in controlling the bike through better grip. A looser brake will also allow the index finger to rest on and wrap around the lever, thereby significantly reducing the reaction time associated with braking.
There is too loose. If the brake pulls to the bar before it stops the bike, that would be too loose. One must also consider pad wear when adjusting the throw. If the pads wear more than lever is able to account for before it hits the grip, that would be too loose. If the brakes don’t stop the bike, they’re not so useful.
These are the brakes we’re talking about here. They are very, very important. Making them anything less than fully functional would be unsafe and irresponsible. Don’t attempt any of my suggestions if you are not fully competent working on your own brakes. I suggest finding a savvy bicycle mechanic to discuss the matter with. Thanks for tuning in.
KC