| Standard: | Threading | Adjustable (left) cup/cone direction |
Fixed (right) cup/cone direction |
Shell Width |
Applications/Notes |
|---|---|---|---|---|---|
| British I.S.O. |
1.370″ X 24 tpi 1.375″ X 24 tpi |
right | left | Standard 68 mm O.S. 73 mm |
The overwhelming majority of bicycles in current production. British and I.S.O. are interchangeable. |
| Shimano Hollowtech II, FSA MegaExo, RaceFace X-type | ISO | right | left | 90 mm, 95 mm including cups | External cups for cartridge bearings fit British/ISO threaded bottom brackets or unthreaded shell. 24 mm spindle, spacer to use 6805 bearings with 25mm I.D.. Bottom bracket shell must be faced so cups are parallel. |
| Campagnolo Ultra-torque | Italian or ISO | Spindle diameter 25mm. | |||
| Chater Lea | 1.450 x 26 TPI | right | left | Obsolete British size but available from Phil Wood & Co. | |
| French | 35 mm X 1mm (25.4 tpi) | right | right (wrong!) |
68 mm | Obsolete, used on older French bicycles. Prone to problems due to the right threaded fixed cup, which tends to unscrew itself in use. |
| ISIS Overdrive I | 48 x 1.5 mm | right | left | 68mm 100 mm |
|
| ISIS Overdrive II | 48 x 1.5 mm | right | left | 68mm 100 mm |
New proposed standard oversized system. |
| Italian | 36 mm X 24 tpi | right | right (wrong!) |
70 mm | Italian and some high-end French bicycles. Prone to problems due to the right threaded fixed cup, which tends to unscrew itself in use. |
| Raleigh | 1 3/8″ X 26 tpi | right | left | 71 mm 76 mm |
Older British-made Raleighs, 3 speeds and others from the Nottingham factory. |
| Swiss | 35 mm X 1mm (25.4 tpi) | right | left | 68 mm | Same thread as French, but fixed cup is left- threaded for reliability. |
What happens if you try to mix different sizes:
| Bottom Bracket Shell Threading (Below) |
British I.S.O. 1.37/1.375″ x 24 tpi CUPS R-L (34.8/34.9 x 1.06 mm) |
Italian 36 mm X 24 tpi CUPS R-R (1.417″ x 1.06 mm) |
French 35 mm X 1mm CUPS R-R (1.378 x 25.4 tpi) |
Swiss 35 mm X 1mm CUPS R-L (1.378 x 25.4 tpi) |
Raleigh 1 3/8″ X 26 tpi CUPS R-L (34.9 x 1.06 mm) |
|---|---|---|---|---|---|
| British/I.S.O. 1.37/1.375″ x 24 tpi (34.8/34.9 x 1.06 mm) |
Made to Fit | 36 mm Cup diameter is too large, thread won’t even start. | Cup diameter is slightly too large, usually won’t start. Right (fixed) cup threaded in the opposite direction. |
Cup diameter is slightly too large, usually won’t start. | Diameter matches, but thread pitch does not.Will bind after only a few threads are engaged. |
| Italian 36 mm X 24 tpi (1.417″ x 1.06 mm) |
British/I.S.O. cups fall through | Made to Fit | Italian shells are larger diameter, all other size cups fall right through, threads will not engage. | ||
| French 35 mm X 1mm (1.378 x 25.4 tpi) |
35 mm = 1.378″. Shell is slightly larger, thread pitch slightly finer. Left side may seem to fit, but will be loose. |
36 mm Cup diameter is too large, thread won’t even start. | Made to Fit | Left (adjustable) side is interchangeable. Right (fixed) side is threaded in the opposite direction, won’t fit. |
35 mm = 1.378″. Shell is slightly larger, thread pitch slightly coarser. Left side may seem to fit, but will be loose. |
| Swiss 35 mm X 1mm (1.378 x 25.4 tpi) |
35 mm = 1.378″. Shell is slightly larger, thread pitch slightly finer. May seem to fit, but will be loose. | 36 mm Cup diameter is too large, thread won’t even start. | Left (adjustable) side is interchangeable. Right (fixed) side is threaded in the opposite direction, won’t fit. |
Made to Fit | 35 mm = 1.378″. Shell is slightly larger, thread pitch slightly coarser. May seem to fit, but will be loose. |
| Raleigh 1 3/8″ X 26 tpi (34.9 x 0.977 mm) |
Diameter matches, but thread pitch does not.Will bind after only a few threads are engaged. | 36 mm Cup diameter is too large, thread won’t even start. | Cup diameter is slightly too large, usually won’t start. Right (fixed) cup threaded in the opposite direction. |
Cup diameter is slightly too large, usually won’t start. | Made to Fit |
Chainline Dimensions (See also my Chainline Article )
| Application | Dimension | Notes |
|---|---|---|
| Track/Coaster Brake Traditional One-Speed Most internal gear hubs |
40.5-42 mm | Older bikes with 110 spacing would be on the smaller end of this range Newer bikes with 120 mm spacing normally use 42 mm |
| Road Double | 43.5 mm | Shimano spec, measured to the midpoint between the rings. with typical 5 mm chainring spacing, this puts the inner at 41 mm, the outer at 46 mm. |
| Road Triple | 45 mm | Shimano spec, measured to the middle ring. |
| Singlespeed MTB Alternate |
47.5 mm | White Industries ENO hubs use this chainline, which lines up with the middle position of a typical MTB triple. It’s also fairly close to the outer position of a typical « road » double. |
| MTB Triple | 47.5-50 mm | Shimano spec, measured to the middle ring. 47.5 preferred, but for frames with oversized seat tubes, the longer dimension may be needed, because the fat tube places the front derailer mechanism farther to the right. SRAM standard chainline is 49mm with 142mm OLD and thru axle |
| Singlespeed and Single-chainwheel MTB, « Boost 148 » | 52 mm | Wider chainline need for chainstay clearance on newer MTBs, typically with disc brakes and 148 mm OLD spacing This is close to the chainline of the outer ring of a typical MTB triple. |
| Rohloff Speedhub | 54 mm (58 mm w/13 tooth) |
Sprockets are proprietary, threaded. All except the 13-tooth may be flipped over to double wear life. |
| Freeride and Downhill | 55 mm | Newer Freeride and Downhill bikes with 150 mm spacing |
| Tandem | about 60 mm | Tandems with 160 mm spacing |
| Fatbike | 66 mm | Fatbikes with 170 mm spacing |
| Fatbike | 76 mm | Fatbikes with 190 mm spacing — needed with 4.8″ (125 mm) wide tires. |
Far far away, behind the word mountains, far from the countries Vokalia and Consonantia, there live the blind texts. Separated they live in Bookmarksgrove right at the coast of the Semantics, a large language ocean. A small river named Duden flows by their place and supplies it with the necessary regelialia. It is a paradisematic country, in which roasted parts of sentences.
One day however a small line of blind text by the name of Lorem Ipsum decided to leave for the far World of Grammar. The Big Oxmox advised her not to do so.
When she reached the first hills of the Italic Mountains.
A wonderful serenity has taken possession of my entire soul, like these sweet mornings of spring which I enjoy with my whole heart. I am alone, and feel the charm of existence in this spot, which was created for the bliss of souls like mine. I am so happy, my dear friend, so absorbed in the exquisite.
For the happiest life, days should be rigorously planned, nights left open to chance.
I should be incapable of drawing a single stroke at the present moment; and yet I feel that I never was a greater artist than now. When, while the lovely valley teems with vapour around me, and the meridian sun strikes the upper surface of the impenetrable foliage of my trees, and but a few stray gleams steal into the inner sanctuary, I throw myself down among the tall grass by the trickling stream; and, as I lie close to the earth, a thousand unknown plants are noticed by me.
DEMO POST TITLE IN UPPER CASE
When I hear the buzz of the little world among the stalks, and grow familiar with the countless lorem ipsum dolor indescribable forms of the insects and flies, then I feel the presence of the Almighty, who formed us in his own image, and the breath. One morning, when Gregor Samsa woke from troubled dreams, he found himself transformed in his bed into a horrible vermin. He lay on his armour-like back.
The List for doing things
- Start International News & Magazine Websites
- Installing Themes
- Purchase PenNews on Themeforest
In a free hour, when our power of choice is untrammelled and when nothing prevents our being able to do what we like best, every pleasure is to be welcomed and every pain avoided. But in certain circumstances and owing to the claims of duty or the obligations of business it will frequently occur that pleasures have to be repudiated and annoyances accepted. The wise man therefore always holds in these matters.
CHANGE YOUR THOUGHTS, YOU CHANGE YOUR WORLD
If several languages coalesce, the grammar of the resulting language is more simple and regular than that of the individual. The new common language will be more simple and regular than the existing European.
POST TITLE NEXT TO IMAGES
It showed a lady fitted out with a fur hat and fur boa who sat upright, raising a heavy fur muff that covered the whole of her lower arm towards the viewer. Gregor then turned to look out the window at the dull weather. Maecenas nec odio et ante tincidunt.
Nullam quis ante. Etiam sit amet orci eget eros faucibus tincidunt. Duis leo.
The bedding was hardly able to cover it and seemed ready to slide off any moment. His many legs, pitifully thin compared with the size of the rest of him, waved about helplessly as he looked. « What’s happened to me? » he thought. It wasn’t a dream. His room, a proper human room although a little too small, lay peacefully between its four familiar walls. A collection of textile samples lay spread out on the table – Samsa was a travelling salesman – and above it there hung a picture that he had recently cut out of an illustrated magazine and housed. Everyone realizes why a new common language would be desirable: one could refuse to pay expensive translators.
The European languages are members of the same family. Their separate existence is a myth. For science, music, sport, etc, Europe uses the same vocabulary. The languages only differ in their grammar, their pronunciation and their most common words. Everyone realizes why a new common language..
Do not mind anything that anyone tells you about anyone else.
It wasn’t a dream. His room, a proper human room although a little too small, lay peacefully between its four familiar walls. A collection of textile samples lay spread out on the table – Samsa was a travelling salesman – and above it there hung a picture that he had recently cut out of an illustrated magazine and housed in a nice, gilded frame. It showed a lady fitted out with a fur hat and fur boa who sat upright, raising a heavy fur muff that covered the whole of her lower arm towards the viewer. Gregor then turned to look out the window at the dull weather. She packed her seven versalia, put her initial into the belt and made herself on the way.
One morning, when Gregor Samsa woke from troubled dreams, he found himself transformed in his bed into a horrible vermin. He lay on his armour-like back, and if he lifted his head a little he could see his brown belly, slightly domed and divided by arches into stiff sections.
