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Bridge wheel seat or frame

Fiber and communications infrastructure knowledge brief Published 06 May 2024

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

In bicycles, a bridge usually refers to a small tube connecting the seat stays or chainstays, while in railway vehicles, a bridge refers to the axle or bogie structure connecting wheels and supporting the vehicle.

Bicycle Frame Bridges

In bicycles, the bridge is a structural tube that connects either the seat stays or chainstays of the rear triangle of the frame. The seat stay bridge connects the two seat stays near the rear brake mount, while the chainstay bridge connects the chainstays closer to the bottom bracket or rear wheel. These bridges provide additional stiffness and strength, prevent frame flex, and sometimes serve as mounting points for brakes or fenders.

Improper wheel seating can cause the tire to rub against these bridges, especially in narrow frames or when the wheel is misaligned. Frame bridges are integral to the diamond frame design, which consists of a main triangle and a rear triangle. The rear triangle includes the seat tube, chainstays, and seat stays, with bridges enhancing rigidity and maintaining proper wheel alignment.

Railway Wheel or Axle Bridges

In railway vehicles, a bridge often refers to the axle bridge or bogie frame that connects the wheels and supports the vehicle body. The bogie axle bridge improves structural strength and rigidity, distributes stress evenly, and accommodates components like springs, brakes, and wheelsets. It is critical for stability, safety, and ride comfort, especially in narrow-gauge or low-floor designs.

The wheelset is mounted on the axle bridge, which may include axle heads, spring mounting seats, and brake discs. Proper design ensures that the wheels are correctly spaced, aligned, and capable of handling heavy loads while maintaining smooth operation. Key DifferencesFeatureBicycle BridgeRailway Axle/Bogie BridgeFunctionConnects frame stays, adds stiffness, brake/fender mountConnects wheels, supports vehicle, distributes loadLocationRear triangle of frameBogie or axle assemblyMaterialsSteel, aluminum, carbonSteel or high-strength alloysIssuesTire rubbing if wheel misalignedMisalignment affects stability and safetyUnderstanding the context is crucial: in bicycles, the bridge is part of the frame, while in railways, it is part of the wheel/axle system.

Both serve to enhance structural integrity and ensure proper alignment of wheels.

Bridge wheel seat or frame - ENSAA OPTICAL NETWORKS [PDF]

Bridge wheel seat or frame

Bicycle frame

OverviewFrame tubesVariationsFramesetFrame geometryFrame materialsButted tubingBraze-ons

The diamond frame consists of two triangles, a main triangle and a paired rear triangle. The main triangle consists of the head tube, top tube, down tube and seat tube. The rear triangle consists of the seat tube, and paired chain stays and seat stays. The head tube contains the headset, the bearings for the fork via its steerer tube. In an integrated headset, cartridge bearings interface directly with the surface on the insid

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You can get the wheel true in the frame by using either the brake shoes (if the bike has rim brakes) or a set of zip-ties strapped around the seat stays and the seatstay bridge and use them as

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The ''quick and dirty'' method is to fit the bridge as normal, ignore the hole in the frame, and lash the bridge piece to the frame using a couple of zip ties instead. This actually works as well

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As a rule, I don''t install stay bridges on any of the frames I build. I will install one if I see that the shape of the stays has created a natural void that just begs for an additional curve.

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For example frames with forward-facing dropouts are usually set up so that the wheel can slide an inch or so forwards without the mudguard fouling (so the wheel will come out) and this

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Singlespeed & Fixed Gear - removing seat stay bridge? - I''ve a really tight Duratec aluminium track frame, and realized the seat stay bridge is so tight a 23mm tire won''t fit.

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Four holes in the fender, in the same way fenders are attached to the bridge on suspension forks. If you want to stand it off the junction, use some thick wall tubing and feed the cable ties through. Seems

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I have a2007, 26", specialized MTB, that I''d like to convert to a ''gravel bike'' type thing. The biggest tire the frame can accommodate with a 700c rear wheel is 32mm. I''d PREFER to use a

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Hi, as when brazing in the SS bridge pulls dropouts together - I''ve heard, that some people put additional spacers to the axle, so it''s not eg 142 but more so after the whole operation

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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