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Topic: Bottom bracket


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In the News (Wed 30 May 12)

  
  Sheldon Brown's Bicycle Glossary Bo--Bz
Also, the tube (often adjustable by telescoping) that holds the "bottom bracket" on a short-wheelbase recumbent.
The part of the frame around which the pedal cranks revolve, also the bearings and axle assembly that runs through the bottom bracket shell of the frame.
Standard bottom bracket bearing assemblies are specified in terms of width of the bottom bracket shell (generally 68, 70 or 73 mm) and the length of the spindle (102 - 130 mm.)
www.sheldonbrown.com /gloss_bo-z.html   (3450 words)

  
  Replacing the Bottom Bracket
The bottom bracket type must match the crank type (a crank with a square hole must be mounted on a BB with the square receiver).
Bottom brackets also come in different widths, and with different spindle widths: the bracket width should match the frame, and the spindle width should put the cranks out away from the frame, and allow the front derailleur to transfer the chain onto the smallest ring without hitting the bike frame.
Looseness of the bottom bracket is detected by a subtle "floppiness" of the cranks as you apply inward or outward pressure on the end of the crank-arm.
www.utahmountainbiking.com /fix/bracket.htm   (1091 words)

  
 Bottom_Bracket
The bottom bracket on a bicycle contains an axle to which the crankset is attached and the bearings that allow the axle and cranks to rotate.
Sealed cartridge bottom brackets are normally two pieces, a unit holding the axle and bearings that screws in to the bottom bracket shell from the drive side and a support cup (often made of light alloy or plastic) that supports the axle/bearing assembly on the non-drive side.
The bottom bracket is offset in the plug, so by rotating the plug, the location of the bottom bracket (and hence the chain tension) may be adjusted.
www.spadout.com /wiki/index.php/Bottom_Bracket   (1413 words)

  
 Bottom Bracket Height
Bottom bracket height is is the height of the centerline of the bottom bracket axle above the ground and should be determined by your need for pedal to ground clearance.
A bottom bracket height of 11 inches or higher may be required for these races depending on riding style and rider confidence.
A higher bottom bracket height raises the saddle relative to the handlebars.
www.billbostoncycles.com /bottom_bracket_height.htm   (583 words)

  
 Bicycle Bottom Bracket - GICLWiki
At the bottom of the frame there is a hollow piece of tubing which contains a part of the crank arm, extends from one side of the frame to the other and connects the crank arms together.
The bottom bracket is connected to one of the crank arms and the bearings are placed on the outside of the bottom bracket which is inserted into the hollow part of the frame.
The bottom bracket is a hollow part in the bottom of the frame that allows for the crank arms to move smoothly and be held to the frame.
gicl.cs.drexel.edu /wiki/Bicycle_Bottom_Bracket   (492 words)

  
 Elica bottom bracket a new spin on the old shell game - Stella Azzurra products
Seldom seen, but often heard, is the road bike's bottom bracket.
The focal point of incredible stress during a race or training, the bottom bracket is what supports your machine's drive train at the beginning and throughout every powerful pedal stroke.
With this in mind, Stella Azzurra has developed what we believe is the ultimate in bottom bracket setups: our quiet, silky-smooth and very elegant Elica.
www.stellaazzurra.com /Bottom-brackets/Elica.php   (117 words)

  
 Gary Fisher > Glossary
Frame tubes that connects the bottom bracket to the rear dropouts, where the rear wheel is attached.
The distance from the center of the bottom bracket to the center of the pedal axle.
The distance of a line parallel to the ground from the centerline of the bottom bracket to the centerline of the rear hub.
www.fisherbikes.com /utility/glossary.asp   (1912 words)

  
 Dave Moulton's Bike Blog: Bottom Bracket Height
Bottom bracket drop is the measurement from the bicycle’s wheel center, to the center of the bottom bracket.
It is the measurement from the center of the bottom bracket to any level surface that the bicycle is sitting.
The disadvantage of a high bottom bracket is that it makes it difficult to reach the road with your foot when you come to a stop.
davesbikeblog.blogspot.com /2007/02/bottom-bracket-height.html   (1034 words)

  
 Build a tandem frame from scrap
A tandem's bottom brackets ought to be somewhat higher than a road bike's, to allow the pedals to clear the road surface in spite of the longer wheelbase.
The vertical distance (perpendicular to the string and parallel to the centerline of the frame) between the string or rope and the bottom bracket axis is the difference between the tire outside radius and the bottom bracket height.
The vertical distance from the rope to the front bottom bracket axis was therefore 12.75 - 11.25 inches, or 1.5 inches (37 mm); and to the rear bottom bracket axis, 12.75 - 11 inches, or 1.75 inches (44 mm).
www.bikexprt.com /bicycle/tandem.htm   (3046 words)

  
 BikePro.com / Buyer's Guide / Bottom Bracket Index - Bicycle Parts at discount prices / the Buyer's Guide / Bicycle ...
BikePro.com / Buyer's Guide / Bottom Bracket Index - Bicycle Parts at discount prices / the Buyer's Guide / Bicycle Parts at their finest!
How to copy your friends iTunes Library (and add it to your own)
Archival Reviews of Bottom Brackets No Longer Made
www.bikepro.com /products/bottom_brackets/bottom_brackets.shtml   (54 words)

  
 Branford Bike: Park Bottom Bracket Cutting Tool Tips
Bottom bracket shells may be out of round due to welding during manufacturing.
Some bottom brackets are marked with LH and RH that do refer to side of bike.
Please note that the Shimano cartridge bottom bracket is marked (L= Left and R = Right) in reference to which side of your bike the cup should go into.
www.branfordbike.com /bottombr/bb7.html   (1968 words)

  
 BOTTOM BRACKET
Bottom Brackets are probably the scariest thing for a newbee to take on, at least mentally, but we all have to get inside one sooner or later and this is my first one.I read your great reply, on B.B. R&R, and found it very usefull, and easy to follow.
note some modern cranks have splined bottom bracket interfaces (where the crank arm connects to the BB spindle) and a fitting built into the crank arm that when loosened will automatically remove the arm.
To remove the bottom bracket you will need Park tool bbt-2 this fits all Shimano and most ISIS (a new standard used by some other crank manufacturers) bottom brackets.
www.webmountainbike.com /bottombracket.html   (1142 words)

  
 Alex Singer Bottom Bracket
The bottom bracket was first stripped down, and the original bearings and the cups discarded.
The bracket axle was then machined to remove the fixed cones and reduced in diameter to provide a journal on both sides, for the annular bearing inner race.
The bracket was completed by the fitment of the two dust-caps, effectively trapping the whole assembly.
www.flying-scot.co.uk /miscellaneous/bicycle/other_marques/singer/singer.html   (1031 words)

  
 Bicycle Repair: Cronic Bottom Bracket Noises
I was hearing excessive noise coming from the bottom bracket as well as the crank rubbing the derailure at one point in the rotation.
If you replace the bottom bracket you could likely fix the problem but it is also likely that it could simply be some interference with the threads.
I removed the cranks, and bottom bracket, cleaned the threads on the frame, and coated everything in assembly lubricant.
en.allexperts.com /q/Bicycle-Repair-1824/Cronic-Bottom-Bracket-Noises.htm   (512 words)

  
 Bottom bracket (Jobst Brandt)
Bottom Bracket Info (Jobst Brandt jobst_brandt@hplabs.hp.com) The four kinds of BB threads in common use today are Italian, British, French, and Swiss, possibly in that order of occurrence.
Date: 29 Aug 2000 23:13:28 GMT Steve Freides writes: > English bottom brackets (and most these days are English) to work the > original poster thinks they should; the drive side is reverse threaded > and the left side isn't.
The kind where you put the Campagnolo bracket tool in a large vise and use the frame as leverage as you rotate it about the vise.
www.yarchive.net /bike/bottom_bracket.html   (1027 words)

  
 Peter Verdone
This was an XT level bottom bracket that came as a sealed unit, ran smooth, with little resistance, and lasted vertually forever.
The new HollowTech II bottom brackets are not on that level.
Original part numbers for replacement bottom brackets are XT - SH14505 (Part No. Y1FU98110) and XTR - SH14500 (Part No. Y1E598240), The bearings used in all of these bottom brackets are single row, deep groove 6805 2RS1 (25 ID,37 OD,7 WD) with both sides having a neoprene labarinth seal.
www.peterverdonedesigns.com /bikebottombrackets.htm   (811 words)

  
 Tech Talk: Bottom Brackets
The Shimano bottom bracket is a very easy to install piece that seems to work as well as the Campy unit.
They use a special bottom bracket tool, which is heavy enough to kill somebody if you drop it on them.
Campy uses a 103mm bottom bracket for Record and Chorus and the rest of the gruppos use the 111mm and 115mm bottom brackets for all the other cranks including the Racing Triple.
www.campyonly.com /techtalk/techtalk5.html   (687 words)

  
 Bottom bracket   (Site not responding. Last check: )
The bottom bracket on a bicycle contains the parts to which the cranks and chainrings and pedals are attached.
The cranks are connected to a bottom bracket spindle, rotating on bearings inside the bottom bracket shell.
This makes servicing the bottom bracket a simple matter of removing the old cartridge from the bottom bracket shell, and installing a new one in its place.
www.fact-index.com /b/bo/bottom_bracket.html   (141 words)

  
 Park Tool Website
Most cartridge bottom brackets are held by retaining rings or cups on either side.
Some bottom bracket models use a steel or aluminum ring on one side and a plastic ring opposite.
If the bottom bracket frame shell is aluminum or titanium, use Park Tool ASC-1 Anti Seize Compound.
www.parktool.com /repair/readhowto.asp?id=94   (1225 words)

  
 Bottom Brackets for Bicycles - relpacment bearings for Race Face Deus, Shimano, XTR, XT,Saint, FSA, Ritchey, Campy, ...
All sets are universal to fit English thread Bottom Bracket Shells and are adjustable for 68 or 73mm widths.
Featuring three slide on cartridge bearings (two on the drive side), this bottom bracket was built for the performance driven Freerider looking to pimp out their ride.
Featuring a thick M12 spindle wall and three slide on cartridge bearings (two on the drive side), this bottom bracket was built for the performance driven Freerider looking to pimp out their ride.
www.trails-edge.com /retail/bikeparts/bottombracket_bearings.htm   (796 words)

  
 Replace your bottom bracket - BIKEmagic Maintenance
Once upon a time, all bottom brackets were adjustable cup-and-cone affairs that could be stripped, cleaned, regreased, refitted and readjusted.
You'll need a crank extractor to suit your cranks, a bottom bracket tool to suit your bottom bracket, a big spanner to drive them with and whatever Allen key or socket you need to undo and tighten the crank bolts.
On cheaper bottom brackets this'll be plastic so you can get away without anti-sieze.
www.bikemagic.com /news/article/mps/UAN/3129/V/4/SP/332788508585406165402   (1275 words)

  
 SignOnSanDiego.com > News > Nation -- House votes to make bottom bracket's tax cuts permanent
The tax bracket bill, passed 344-76, makes permanent the bottom tax bracket created in 2001, when the tax on the first $6,000 in earned wages was lowered from 15 percent to 10 percent.
The bracket is to shrink back to $6,000 next year and disappear entirely in 2011.
Democrats would have stipulated that, after 2010, the bottom bracket would have remained in place only if White House budget officials projected the federal balance would be balanced by 2014.
www.signonsandiego.com /news/nation/20040513-1405-taxbrackets.html   (622 words)

  
 How to Adjust a Bottom Bracket - eHow.com
Here are instructions for adjusting the cup-and-cone-style bottom brackets found on most bikes built before the mid-1990s.
You should be able to adjust the bottom bracket without removing the cranks.
If your bottom bracket hasn't been touched in a while, you may want to loosen the lock ring and grease the threads before you retighten it.
www.ehow.com /how_14180_adjust-bottom-bracket.html   (392 words)

  
 EuroBike gives a peek at 2006... and beyond
The Pro Machine, meanwhile, is made from Easton's CNT nanotube-reinforced unidirectional carbon fiber, and boasts what have to be the thickest and tallest chainstays in the world, the better to brace the massive bottom bracket area.
The toptube and downtube shapes are also interesting, widening at the head tube and bottom bracket for better rigidity.
For the moment, feast your eyes on the revised 486 frameset, the 496 TT bike ridden by the Crédit Agricole team, the new Keo Sprint pedal, and the HSD stem, all of which were solidly affixed to their moorings and looked likely to remain in place for the duration of the show.
www.velonews.com /tech/report/articles/8800.0.html   (1318 words)

  
 How to Install a Bike's Bottom Bracket - eHow.com
STEP 7: Insert the cartridge into the bottom bracket shell on the drive side, and thread the drive side cup into the frame.
STEP 8: Using the wrench and bottom bracket tool, tighten the drive side cup until the lip presses up firmly against the outside of the bottom bracket shell.
If you are unsure, check the torque specs for the bottom bracket, and use a torque wrench.
www.ehow.com /how_14184_install-bikes-bottom.html   (469 words)

  
 bottom bracket woes.
After doing some reading about the kinds of bottom brackets that I might find upon pulling the crank arms, I was puzzled to find neither a standard-looking lockring for a serviceable BB, NOR a splined surface to use the cartridge bottom bracket tool on.
It appears to have a C-shaped type of retaining ring with small holes(pin wrench fittings?) at both termini of the ring and I have no idea how to remove it in order to even find out what kind of BB it is. Any suggestions are appreciated.
Without a threaded bottom bracket, your chances to upgrade are slim.
www.bikeforums.net /archive/index.php/t-771.html   (662 words)

  
 Bottom Brackets ~ Smooth as silk
If you’ve ever seen Crupi’s displays at the races, then you know first hand why our bottom brackets are unmatched by any other.
For frames with a large, American style bottom bracket, our large bottom bracket has all the same advantages as our smaller European style bottom bracket.
The economical way to make your European bottom bracket fit into a large bottom bracket shell.
www.crupibmx.com /bottom_brackets.htm   (240 words)

  
 BicycleBuys.com - Campagnolo Chorus Bottom Bracket Campagnolo Record Bottom Bracket FSA Platinum BottomBracket FSA ...
Except for a few, small differences in materials, the Chorus bottom bracket, like almost all the other components in the groupset, is a clone of the Record.
The new bottom bracket bearings to be spaced wider apart & the axle & bearings are larger.
The new Ultegra bottom brackets' bearings and cups thread in to the frame allowing for a smooth yet rigid ride in the bottom bracket area.
www.bicyclebuys.com /HTML/BottomBrackets.htm   (494 words)

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