I want to service the botom bracket on the Benotto Modelo 800 I just got, but Sheldon Brown says something about odd threading:
Italian 36mm X 24 tpi right right (wrong!) 70mm Italian and some high-end French bicycles. Prone to problems due to the right threaded fixed cup, which tends to unscrew itself in use.
Does this mean (as it seems to me) that to get the bottom bracket out I have to unscrew both ends by turning 'the normal way' - ie, counter-clockwise, like taking off a jam jar lid?
And as a secondary query, it will take 1 1/4" bearings, won't it?
I want to service the botom bracket on the Benotto Modelo 800 I just got, but Sheldon Brown says something about odd threading:
Italian 36mm X 24 tpi right right (wrong!) 70mm Italian and some high-end French bicycles. Prone to problems due to the right threaded fixed cup, which tends to unscrew itself in use.
Does this mean (as it seems to me) that to get the bottom bracket out I have to unscrew both ends by turning 'the normal way' - ie, counter-clockwise, like taking off a jam jar lid?
Yes. There's a good chance that the fixed cup will be done up as tight as a tight thing to prevent it unscrewing. A long lever may be required. Failing that, Sheldon also has a Top Tip on removing stuck BB cups, using a nut and bolt.
Thanks. I found Sheldon's tip. Looks really good. All I need now is a humungously big bolt! Down to the ironmonger's at the weekend, methinks.
"Tim Hall" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
Alan Paterson said:
I want to service the botom bracket on the Benotto Modelo 800 I just got, but Sheldon Brown says something about odd threading:
Italian 36mm X 24 tpi right right (wrong!) 70mm Italian and some high-end French bicycles. Prone to problems due to the right threaded fixed cup, which tends to unscrew itself in use.
Does this mean (as it seems to me) that to get the bottom bracket out I
have
Quoted message said:
Quoted message said:
to unscrew both ends by turning 'the normal way' - ie, counter-clockwise, like taking off a jam jar lid?
Yes. There's a good chance that the fixed cup will be done up as tight as a tight thing to prevent it unscrewing. A long lever may be required. Failing that, Sheldon also has a Top Tip on removing stuck BB cups, using a nut and bolt.
Another excellent tip, for which many thanks. (Tho' I suspect it will have to come off...it's a dodgy feeling on that side that convinces me I really need to get in and check it out...)
Cheers
Alan "M-gineering" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
Alan Paterson said:
Thanks. I found Sheldon's tip. Looks really good. All I need now is a humungously big bolt! Down to the ironmonger's at the weekend, methinks.
unless you need to replace the RH cup leave it in place -- --- Marten Gerritsen
Another excellent tip, for which many thanks. (Tho' I suspect it will have to come off...it's a dodgy feeling on that side that convinces me I really need to get in and check it out...)
Cheers
Alan "M-gineering" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
Alan Paterson said:
Thanks. I found Sheldon's tip. Looks really good. All I need now is a humungously big bolt! Down to the ironmonger's at the weekend, methinks.
unless you need to replace the RH cup leave it in place -- --- Marten Gerritsen
Another excellent tip, if you are using Sheldon Brown's bolt method, is not to ask your wife to stop the nut turning inside the BB by holding a short socket wrench whilst you heave on the bolt with a much longer wrench. Only when I heard the scream of pain, as her hand got trapped between the wrench and the chain stay, did I realise that once the shell started to move she had no possibility of stopping the wrench she was holding turning with the shell. Add one bunch of flowers to the cost of upgrading the bike.
Another excellent tip, for which many thanks. (Tho' I suspect it will have to come off...it's a dodgy feeling on that side that convinces me I really need to get in and check it out...)
Cheers
Alan "M-gineering" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
Alan Paterson said:
Thanks. I found Sheldon's tip. Looks really good. All I need now is a humungously big bolt! Down to the ironmonger's at the weekend, methinks.
unless you need to replace the RH cup leave it in place -- --- Marten Gerritsen
Another excellent tip, if you are using Sheldon Brown's bolt method, is not to ask your wife to stop the nut turning inside the BB by holding a short socket wrench whilst you heave on the bolt with a much longer wrench. Only when I heard the scream of pain, as her hand got trapped between the wrench and the chain stay, did I realise that once the shell started to move she had no possibility of stopping the wrench she was holding turning with the shell. Add one bunch of flowers to the cost of upgrading the bike.
Thanks to everyone who responded to my original post. I did the deed this weekend and all went tickety-boo, thanks in large part to your help.
Cheers
Alan "Alan Paterson" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
I want to service the botom bracket on the Benotto Modelo 800 I just got, but Sheldon Brown says something about odd threading:
Italian 36mm X 24 tpi right right (wrong!) 70mm Italian and some high-end French bicycles. Prone to problems due to the right threaded fixed cup, which tends to unscrew itself in use.
Does this mean (as it seems to me) that to get the bottom bracket out I
have
Quoted message said:
to unscrew both ends by turning 'the normal way' - ie, counter-clockwise, like taking off a jam jar lid?
And as a secondary query, it will take 1 1/4" bearings, won't it?
