- Feedback
- View
I've got 113mm fitted at the moment and the front mech wont reach the large ring. Is there like 100mm bottom brackets out there?
What's the shortest Square Taper BB?
- Thread starter jimmy5willy
- Start date
- Feedback
- View
Re:
Shell width isn't an issue but will focus my search on 103mm then. Thanks.
Shell width isn't an issue but will focus my search on 103mm then. Thanks.
syncrosfan
Senior Retro Guru
For mountain bikes, the shortest I've known is 107mm. If you go the road bike route you can go down to 105 or even 103mm.
Sheldonbrown's site shows recommended lengths for most usual cranksets. Actually the 103mm one is used on one series of Dura-Ace cranks (and few others, not really common ones, not even sure if some mtb ones use that). So I would be afraid the cranks will need more not to touch chainstays.
(unless it is a FD issue, such as when using road shifters and mtb FD, it also usually doesn't reach)
(unless it is a FD issue, such as when using road shifters and mtb FD, it also usually doesn't reach)
- Feedback
- View
Re:
I hear what you're saying but it's not a shifter issue. Theres no shifter connected, I'm just pushing the front mech to full reach.
The chainset is just a shimano chainset, middle of the range. LX maybe? Outer chainring is 42t compact drive so not massive.
In any case I'll whip it out again at the weekend (the bike) and measure the distance from the back of the crank arm to chainstay. That should tell me how much shorter I can go yes?
I hear what you're saying but it's not a shifter issue. Theres no shifter connected, I'm just pushing the front mech to full reach.
The chainset is just a shimano chainset, middle of the range. LX maybe? Outer chainring is 42t compact drive so not massive.
In any case I'll whip it out again at the weekend (the bike) and measure the distance from the back of the crank arm to chainstay. That should tell me how much shorter I can go yes?
- Feedback
- View
Re:
I have a really short NOS something or other that I'd let go if you want it?
I have a really short NOS something or other that I'd let go if you want it?
- Feedback
- View
107 is the shortest tipple on an MTB, used for super low profile crankset like the M900 XTR. similar counter part is the 110, that just gives a bit more on the none drive side.
113 gives a 2.5 mm further out chainring (chainline) at 50mm
every other crank style would push the rings and arms into the chainstays more.
THAT should be capable for any triple MTB front mech.
Quick question... have you screwed the limit screws out.
take a picture and make and M number on the mech, crank etc.
113 gives a 2.5 mm further out chainring (chainline) at 50mm
every other crank style would push the rings and arms into the chainstays more.
THAT should be capable for any triple MTB front mech.
Quick question... have you screwed the limit screws out.
take a picture and make and M number on the mech, crank etc.
- Feedback
- View
Quick question... have you screwed the limit screws out.
take a picture and make and M number on the mech, crank etc.[/quote]
This is a ton of info and I love it!
What is 50mm though?
Limit screw is currently half way out but now you mention it, I could take it out and see what the absolute max is. Good shout.
take a picture and make and M number on the mech, crank etc.[/quote]
This is a ton of info and I love it!
What is 50mm though?
Limit screw is currently half way out but now you mention it, I could take it out and see what the absolute max is. Good shout.
- Feedback
- View
Re:
How far does a chain need to move across for the ramps to flick it up onto the next ring? At the moment and by sight, this front mech isnt moving much past middle ring.
...but then on second thoughts, the derailleur is going to need to be almost centre on the big ring so it doesn't rub?
How far does a chain need to move across for the ramps to flick it up onto the next ring? At the moment and by sight, this front mech isnt moving much past middle ring.
...but then on second thoughts, the derailleur is going to need to be almost centre on the big ring so it doesn't rub?
