Bicycle handlebar


Bicycle handlebar
Conventional drop handlebars with harlequin cloth tape wrapping.
Flat handlebars with a slight rise on a mountain bike.
BMX style bars with cross brace.

Bicycle handlebar or often bicycle handlebars refers to the steering mechanism for bicycles; the equivalent of a steering wheel. Besides steering, handlebars also often support a portion of the rider's weight, depending on their riding position, and provide a convenient mounting place for brake levers, shift levers, cyclocomputers, bells, etc. Handlebars are attached to a bike's stem which in turn attaches to the fork.

Contents

Types of handlebar

Handlebars come in a variety of types designed for particular types of riding.

Drop

Drop ("ergo" or "anatomic") handlebars
"Track" style bars with large-radius curve
"Ergo" or "anatomic" drop handlebars with added Profile 2000 aerobars

Drop handlebars, as used on road or track bicycles, may have a shallow or deep drop. Drop bars may have one or two longitudinal indentations so that the brake and shift cables protrude less when they are wrapped under the bar tape. They may also have a flattened top section.

Track

Track drop bars are a variation of bars designed for the typical riding positions of track bicycle racers. Track drops are characterized by large, sweeping ramps, effectively precluding the top and brake hood hand positions, but promoting the rider's use of the ends, or "hooks". Track bars are designed for use without brake levers, but recently experienced a surge in popularity on use with fixed gear bikes, and as such have been adapted to fit levers and hand positions.

Ergo or anatomic

The shape of the drop may be a simple, traditional curve, or it can have a flat spot (straight section) which some riders find to be more comfortable for their hands. These bars may be described as ergo or anatomic.

Randonneur

Drop bars that rise slightly from the centre in a shallow U, and the drop portion of the bars is set wider than the curve at the top. Designed to be slightly more comfortable than a straight drop bar for bicycles used in Audax riding.

Drop-in

At one time, manufactures and racers experimented with drop-in bars that had an additional extension in toward the head tube at the rear end of the drops. This was intended to offer an even more aerodynamic position, due to low and narrow placement of the hands, than just the drops, while still remaining legal for mass-start races. Their popularity has since waned.

Flat or Riser

"Flat" or "riser" bars are the standard handlebars equipped on mountain bikes, hybrids, and recently on fixed-gear bicycles and flat bar road bikes. A flat bar is a nearly-straight tube, slightly bent toward the rider. A riser is a variation in which the outer sections of the bars rise from the center clamp area. Flat and riser bars may be appended with bar ends, providing more hand positions. The bullmoose style is a variation on the flat bar, common on early mountain bikes, where the stem and bars are a single unit and where the single top section of the stem would be, there are instead 2 bars joined at the quill to the rear and connected to the conventional handlebar section in the front, at two off-center locations, forming a triangle.[1]

North Road handlebars

Upright or North Road

One of the oldest type of handlebars, this type of bar was named after the North Road Cycling Club in London. North Road bars are swept back toward the rider, with each grip ending nearly parallel to each other and the bike. They were used on three-speed and single speed Raleighs, Schwinns, and other three-speed bikes well into the 1980s, as well as various European utility bikes and roadsters. They have recently enjoyed a resurgence in popularity on some hybrid bicycles, city bikes, and comfort models. They are also known as "Townie", or "Tourist" bars. North Road bars can easily be inverted to give a slight amount of drop when a more aggressive riding posture is desired.

Trekking bars

Porteur

Porteur bars sweep backwards towards the rider with a slight drop. They are designed to accommodate front-mounted racks or baskets in order to haul cargo and are usually found on dedicated Porteur bicycles.

Touring or trekking

Sometimes referred to as "Butterfly" bars, these are commonly encountered in continental Europe. They typically consist of a broken figure-of-eight arrangement mounted horizontally on the stem. This style of bar allows the rider to remain relatively upright while at the same time providing a wide range of hand positions for comfort on long duration rides. A variation of the Butterfly bar is fitted to 'P-type' Brompton folding bicycles. It differs from other Butterfly bars in that it is fitted vertically rather than horizontally.

Triathlon or aero

Triathlon bars or aerobars include various styles of aerodynamic handlebars for racing bicycles and particularly time trial bicycles. Included are narrow, bolt-on extensions that draw the body forward into a tucked position, pursuit bars that spread the arms of the rider but drops the torso into a slightly lower position, and integrated units that combine elements of both designs.

Triathlon bars are commonly used in triathlons and time trial events on road and track. However, they are illegal in most mass start road races or any other event where drafting is permitted because, while aerodynamically advantageous, they tend to draw the hands away from brakes, make the rider slightly more unstable on the bike, and can be dangerous in the event of an accident. Further, they are not useful in sprints or shorter climbs where power is of greater importance than aerodynamics.

Specialized shift levers (known as bar-end shifters) do exist that can be installed on some triathlon bars so that they can be reached without moving the hands from the aerodynamic position. The complementary brake levers in this handlebar configuration are placed in the ends of the accompanying pursuit bars.

Aero bars are a recent addition to road racing time trials, with Greg LeMond first using them in the 1989 Tour de France. In a controversial time trial on the final day, LeMond used them to beat yellow jersey wearer Laurent Fignon by 58 seconds, changing a 50 second deficit into an 8 second lead. Fignon protested at the use of these bars but was unsuccessful.

Pursuit

Cut down drop bars repurposed as bullhorn handlebars

Pursuit bars, or Bullhorn handlebars, curve up and forward. They are often used with dedicated triathlon bars (see above), and are also popular, by themselves, on track, single-speed, and fixed-gear bicycles.

This style of handlebar is named after the discipline of track racing where it was originally used, and has the common nickname of "Bullhorn bars" for their appearance.

Bullhorn bars may be constructed simply by cutting the drops off drop bars and then mounting them upside down so that the remaining start of the drop provides a slight upward hook for resting the hands, although this does not provide as much forward extension (reach) or lowering (if desired, normally for time-trial based use) as purpose made bullhorns. These are sometimes called "Flopped and Chopped" or "Flipped and Clipped" bars, and if this is to be done, care should be taken to properly remove the sharp edges from the cuts, and to properly tape and plug the bar ends for safety purposes.

BMX

BMX style handlebars, as used on BMX bicycles, have more rise than straight bars and usually have a cross brace to provide rigidity and strength.

Cruiser

Cruiser handlebars, as used on cruiser bicycles, tend to be long and slope towards the rear of the bicycle so that the rider can sit upright.

A moustache handlebar as seen from the top of the bike

Moustache

Moustache handlebars curve forward from the stem and then back towards the rider. This style was designed in the early 90s by Grant Petersen for the Bridgestone XO-1, based on the semi-drop bars used by schoolchildren in Japan.

Ape hangers

Ape hanger handlebars rise far above the stem so that the rider must reach up to use them, hence the name. This style of bicycle handlebar became wildly popular in the 1960s after the introduction of wheelie bikes such as the Schwinn Sting-Ray, Raleigh Chopper, and other highly stylized youth bicycles that imitated the appearance of drag-racing or chopper motorcycles of the day. They are still frequently seen on lowrider bicycles.

As the result of intense pressure by consumer advocacy organizations to outlaw such handlebars, beginning with Public Citizen in 1971, some U.S. and other jurisdictions actually have regulations on how high the hand grips may be above the seat. For example, the European Standard EN 14764:2005 contains:

4.7 Steering
4.7.1 Handlebar — Dimensions
The handlebar shall have an overall width between 350 mm and 1000 mm unless national regulations dictate otherwise. The vertical distance between the top of the handlebar grips, when assembled to the highest riding position according to the manufacturer's instructions, and the seat surface of the saddle at its lowest position shall not exceed 400 mm.

National or International Standards such as this may have legal force concerning sale of items, while not necessarily being legally binding as regards the use of the items, depending on the jurisdiction.

Under seat steering handlebars on a recumbent

Recumbent

Recumbent bicycles, due to their wide variety, are often equipped with handlebars seen nowhere else. These include handlebars with a very far reach, similar to ape hangers (see above) but mounted less vertically, and handlebars designed for under-seat steering, called Whatton bars.

Whatton

Whatton bars loop behind the legs of penny-farthing riders so that they can still keep their feet on the pedals and also be able to leap feet-first forward off the machine.[2] These are also used on recumbent bicycles for under-seat steering.[3]

Design

Handlebar design is a trade-off between several desirable qualities:

Design goals

The design goals of handlebars varies depending on the intended use of the bicycle. Common to all bicycles are the goals of

  • Providing necessary leverage to steer the bicycle and generate power.
  • Providing a comfortable ride by damping road/offroad vibration
  • Providing a mount point for any brakes and gear levers.

Racing/touring and triathlon bars have additional goals

  • Enabling the rider to assume an aerodynamic position.
  • Enabling the rider to change body positions during long rides, preventing fatigue.
  • Enabling aerodynamic routing of brake/gear cables.

Mountain bike handlebar design goals have less focus on aerodynamics, more on negotiating terrain:

  • Providing enough control to manoeuvre the front of the bicycle over obstacles.
  • Being strong enough to withstand the extra forces generated in some activities/crashes.
  • Optionally: not significantly increasing vehicle weight.

BMX/Trials bike bars have similar needs to mountain bikes:

  • Providing the control needed to execute advanced cycling manoeuvres.
  • Withstanding the forces generated in the process.

Materials

Handlebars are most commonly made of aluminium alloys, but are also often made from steel, carbon fiber or titanium.

Sizes

There are several size parameters to consider when choosing a handlebar

Width

Drop bars come in a variety of widths from 34 cm to 50 cm[citation needed]. Usually a rider will pick a bar that approximately matches their shoulder width so that their arms can be approximately parallel. The width is measured at the end of the drop section but the exact method varies from manufacturer to manufacturer. Some measure from outside edge to outside edge (e.g. Deda, ITM, TTT) whereas others measure from center to center (e.g. Cinelli, Profile Design, Ritchey, Salsa).[4] The figure returned by measuring outside to outside tends to be 2 cm greater than measuring center to center for the same handlebar.

Clamp diameter

Care is needed when choosing a handlebar to match a stem, or vice-versa, as there are several standards. The ISO standard for the clamping area of a handlebar is 25.4 mm (1"), which is used on mountain bikes and many Japanese-made road handlebars. However, the Italian unofficial standard is 26.0 mm, which is the most common clamp size for road bars. There are also intermediate sizes such as 25.8 mm to try and achieve compatibility with either an ISO or Italian stem, and the old Cinelli-specific size of 26.4 mm. In practice, many modern stems with removable faceplates are quite accommodating of slight differences in handlebar clamp size, but the older type of stem with a single pinch bolt must be accurately matched. In the days of quill stems, a road stemwas clearly identifiable from its "7" shape, but nowadays it can be hard to tell the difference between a "road" (26.0 mm) and "MTB" (25.4 mm) stem. Manufacturers frequently omit the clamp size from advertising or packaging.

A new standard is an "oversize" 31.8 mm or 31.7 mm (1.25") clamp for both MTB and road bars. This is popular on mountain bikes, especially those with a focus on "all mountain" and "downhill" activities, as the stem and handlebars can be stronger. This clamp diameter is taking over from the previous mix of sizes on road bicycles with drop-bars. On these stems, standard brake levers can be used as it is only the central section that is oversized. although other accessories that mount near the stem also need to be oversized to fit (some brackets are adjustable). Shims are available to fit a 31.8 mm stem to either a 25.4 mm or 26.0 mm bar, so many new models of stems are oversize-only.

BMX style handlebars require a clamp diameter of 22.2 mm (7/8" 0.875") and are therefore incompatible with any non-BMX specific stem.

Handlebar coverings

Hybrid handlebar with foam rubber covering

Handlebars usually have tape or grips to provide grip and comfort. In general, handlebars which have one riding position have grips, and handlebars which provide several use tape.

Tape

There are many types of handlebar tape:

  • Polyurethane tape, introduced in the last few years, provides cushioning.
  • Composite rubber tape
  • Cork tape, padded tape, provides cushioning but less durable.
  • Bike ribbon, plastic padded tape with smooth waterproof surface.
  • Benotto "Cello-Tape", made from plastic, popular in the 1970s and 1980s. Compared with other types of handlebar tape it is relatively thin and is unpadded; it does not provide any cushioning from road vibrations. However it is long lasting, does not absorb water, was available in a vast range of colours and stays clean. Similar types of "shiny tape" exist.
  • Cotton tape, unpadded woven cotton tape with adhesive backing, similar to twill tape.
  • Leather wrap, for example by Brooks England
  • An inner tube can be cut and wrapped as well
  • A foam rubber tube has been used on inexpensive bikes.

Tape can be applied in several ways, either wrapped from the ends towards the stem or starting near the stem and wrapped towards the ends. The tape is usually held in place at the ends with the bar-end plugs. The other end of the tape can be help in place with adhesive tape, usually electrical insulation tape or, if started near the stem, by first wrapping a few turns towards the stem before reversing direction to anchor it. A figure-eight can be made around the brake lever clamp to completely cover the bar, or a small, separate piece of tape can be place on the back side to cover the small v-shaped section that might otherwise be left bare. Strips of bar gel may optionally be applied to the handebars prior to applying the tape in order to reduce vibration transmission and increase comfort.

Grips

Grips are usually made of firm or soft plastic, foam, gel, or sometimes leather. depending on expected use or desired price. They may be simply smooth and round or molded to fit the shape of a human hand better. Foam grips can be applied by submerging them under water and then inflate them with 200,000 Pa (30 psi) air while massaging them onto the handlebar. Plastic grips can be heated in water and punched onto the handlebar.

Plugs

Handlebars with open ends should have handlebar plugs fitted in the open ends for safety reasons. These can be made of metal, usually steel, or plastic. Without them, the end of the bar can cause serious injury upon hard impact with soft tissue. Plugs are also required by competitive cycling governing bodies.[5][6]

Bar ends

Single (left) bar end.
Pair of bar ends.

In cycling, bar ends are extensions at the ends of the bicycle handlebars. Usually fitted onto mountain bikes with straight handlebars, they extend away from the handlebars and allow the rider to vary the type of grip and posture that they use during a ride. They are especially effective when climbing out of the saddle, because they increase leverage. Bar ends can also improve comfort for the rider due to the neutral position of the hands (palms inward) which places marginally less stress upon the musculature, and by providing more than one place to rest hands on a long journey.

Some handlebars have bar ends welded onto them but most are clamped to the end of the bar. They are available in many shapes and sizes, such as stubby models that are around 100 mm in length to ones that curve around so as to provide even more hand positions. It is also possible to purchase combined ergonomic hand grips with integrated bar-ends

Bar ends were very popular on mountain bikes from the early 1990s until the late 1990s,[citation needed] when upswept "riser bars" came back into fashion; the combination of riser bars and bar ends is rarely seen.

Bar ends can prove troublesome when negotiating twisty tracks between trees as they may hook around branches and cause a crash. They also afford some protection to a rider's hands in a fall or crash. However by moving the hands further from the brake levers, they can increase the time it takes to stop a bicycle.

See also

References

  1. ^ Brown, Sheldon. "Bullmoose Bars". Sheldon Brown. http://www.sheldonbrown.com/gloss_bo-z.html. Retrieved 2010-09-16. 
  2. ^ Wilson, David Gordon; Jim Papadopoulos (2004). Bicycling Science (Third ed.). The MIT Press. pp. 22–23. ISBN 0-262-73154-1. http://books.google.com/books?id=0JJo6DlF9iMC&printsec=frontcover&dq=Bicycling+science&ei=sDRwS_fFC4zKMI28jfsK&cd=1#v=onepage&q=Whatton&f=false. 
  3. ^ Brown, Sheldon. "Whatton Bars". Sheldon Brown. http://www.sheldonbrown.com/gloss_w.html. Retrieved 2010-06-26. 
  4. ^ bicycling.com Bicycling Magazine: Choosing the right handlebar width.
  5. ^ "SlowTwitch Tech Center: Handlebar plugs". http://www.slowtwitch.com/mainheadings/techctr/maintenance/plugs.html. Retrieved 2009-01-22. 
  6. ^ "USCF: Racing Rules for Road, Track, and Cyclocross 2008: 1J.d". http://www.usacycling.org/forms/RdTrkCx_rulebook.pdf. Retrieved 2009-01-22. 

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