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Stuffed rear derailleur
Oh well, looks like I've done it good this time.
I thought I'd try to fix that dodgy rear derailleur on my road bike by swapping it out for a spare one I had lying around. As usual, there is many a slip betwixt the lip and the cup, and yes, the spare derailleur don't fit - maybe becos I had not realised that it came from a MTB - so much so for a wannabe uber technically minded fellow like moi I was right that first time, you know, in that I have skills which are long dormant and it appears that I should have left it that way whilst I was ahead "Never mind", says I, I'll try to fix the old derailleur by banging it and twisting it. You guessed it, the "banging" became "mangling" and the twisting became "more mangling" and I have now "fixed" the old derailleur - well, ok, "vandalised" is probably the more correct description in lieu of a more robust and aggressive term (more gentle souls might be present, you see). More previously dormant skills on display here? {sigh} I'll have to pull the Cannondale out of storage and go get a new rear derailleur from Johnno at Kenso this arvo. Very annoying cos I had cleaned and polished and oiled the Cannondale prior to storage. |
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#2
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Stuffed rear derailleur
On Mon, 24 Jan 2011 11:30:19 +1100, Geoff Lock wrote:
As usual, there is many a slip betwixt the lip and the cup, and yes, the spare derailleur don't fit - maybe becos I had not realised that it came from a MTB The fittings should be the same - the derailleur bolt is the same thread and diameter. The exception is if you've got a super cheap derailleur that clamps the axle and dropout. I suspect, but have never tried, that it'd be possible to cludge the main pivot from the bolt on style into one of those. MTB derailleurs typically have a longer cage so you can run a wider spread of gears. It's fairly common for DH riders to run a road derailleur so that the cage is less likely to get caught, and it works if you only have a single chainring. It's also possible to run MTB derailleurs on road bikes to allow silly large gear ranges (e.g. running an MTB 11-30 cluster for big climbs). The only other gotcha is that there are a couple of different indexing systems around. I think Campagnolo has a different spacing to Shimano, but I'm not sure if the ratio at the derailleur is different. I know 8sp and 9sp are different widths, and 10 is different again. SRAM and Shimano are also incompatible. -- Dave Hughes - "Forty-two" - Deep Thought |
#3
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Stuffed rear derailleur
On 24/01/2011 11:44 PM, Dave Hughes wrote:
On Mon, 24 Jan 2011 11:30:19 +1100, Geoff Lock wrote: As usual, there is many a slip betwixt the lip and the cup, and yes, the spare derailleur don't fit - maybe becos I had not realised that it came from a MTB The fittings should be the same - the derailleur bolt is the same thread and diameter. The exception is if you've got a super cheap derailleur that clamps the axle and dropout. I suspect, but have never tried, that it'd be possible to cludge the main pivot from the bolt on style into one of those. The replacement derailleur didn't have the clamp - it screws onto the dropout(?). MTB derailleurs typically have a longer cage so you can run a wider spread of gears. It's fairly common for DH riders to run a road derailleur so that the cage is less likely to get caught, and it works if you only have a single chainring. It's also possible to run MTB derailleurs on road bikes to allow silly large gear ranges (e.g. running an MTB 11-30 cluster for big climbs). The MTB derailleur I was trying to use is waayyy toooo big and keeps banging into the frame when I try to manually test the range of movement. Also, the cable doesn't seem to go in at the correct angle. Maybe I should have another go at fitting the MTB derailleur on the road bike seeing as you seem to suggest that it is possible. I am not too sure what you mean by an 11-30 cluster - 11T for smallest gear and 30T for largest gear, perhaps? Never mind, I am told that I can have a Suntour rear derailleur for my 7-speed for about $40-50. The ones I saw today were Shimanos for 9 and 10 speed gear sets(?) and cost around $150. Maybe I should just toss out that newish 7-speed I bought and get me a new rear derailleur AND a 10 speed cassette but I suspect I'll need a new chain as well due to closer tolerances between the gears. The only other gotcha is that there are a couple of different indexing systems around. I think Campagnolo has a different spacing to Shimano, but I'm not sure if the ratio at the derailleur is different. I know 8sp and 9sp are different widths, and 10 is different again. SRAM and Shimano are also incompatible. No indexing on my ****ty 40-year old bike Plain ole friction gearing system using crappy levers on the down tube but it works, it works |
#4
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Stuffed rear derailleur
Becos is incorrect spelling from the USA. It is spelt because, please stop
butchering the english language in this country. "Geoff Lock" glock@home wrote in message ... Oh well, looks like I've done it good this time. I thought I'd try to fix that dodgy rear derailleur on my road bike by swapping it out for a spare one I had lying around. As usual, there is many a slip betwixt the lip and the cup, and yes, the spare derailleur don't fit - maybe becos I had not realised that it came from a MTB - so much so for a wannabe uber technically minded fellow like moi I was right that first time, you know, in that I have skills which are long dormant and it appears that I should have left it that way whilst I was ahead "Never mind", says I, I'll try to fix the old derailleur by banging it and twisting it. You guessed it, the "banging" became "mangling" and the twisting became "more mangling" and I have now "fixed" the old derailleur - well, ok, "vandalised" is probably the more correct description in lieu of a more robust and aggressive term (more gentle souls might be present, you see). More previously dormant skills on display here? {sigh} I'll have to pull the Cannondale out of storage and go get a new rear derailleur from Johnno at Kenso this arvo. Very annoying cos I had cleaned and polished and oiled the Cannondale prior to storage. |
#5
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Stuffed rear derailleur
Techo wrote:
Becos is incorrect spelling from the USA. It is spelt because, please stop butchering the english language in this country. Becos is not incorrect spelling from the USA. "Spelt" is incorrect If you are going to waste time correcting people you should get it right. "Geoff Lock"glock@home wrote in message ... Oh well, looks like I've done it good this time. I thought I'd try to fix that dodgy rear derailleur on my road bike by swapping it out for a spare one I had lying around. As usual, there is many a slip betwixt the lip and the cup, and yes, the spare derailleur don't fit - maybe becos I had not realised that it came from a MTB - so much so for a wannabe uber technically minded fellow like moi I was right that first time, you know, in that I have skills which are long dormant and it appears that I should have left it that way whilst I was ahead "Never mind", says I, I'll try to fix the old derailleur by banging it and twisting it. You guessed it, the "banging" became "mangling" and the twisting became "more mangling" and I have now "fixed" the old derailleur - well, ok, "vandalised" is probably the more correct description in lieu of a more robust and aggressive term (more gentle souls might be present, you see). More previously dormant skills on display here? {sigh} I'll have to pull the Cannondale out of storage and go get a new rear derailleur from Johnno at Kenso this arvo. Very annoying cos I had cleaned and polished and oiled the Cannondale prior to storage. |
#6
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Stuffed rear derailleur
On 25/01/2011 6:56 AM, Techo wrote:
Becos is incorrect spelling from the USA. It is spelt because, please stop butchering the english language in this country. G'day, Techo I am assuming you are objecting to the way in which I am spelling "derailleur"? How do you spell it and which country are you from? I like using the "derailleur" spelling becos I think it makes me sound more knowledgeable in matters cycling and I appear more trendy as I cannot afford Lycra clothing to make me so. I am aware of the raging controversy between "derailleur" and "derailler" and I include a link from the late, great Sheldon Brown for your perusal. http://www.sheldonbrown.com/derailer.html Incidentally, are you a Schrader valve or a Presta Valve person? I am a bit embarrassed that I can't offer an opinion myself as I am not quite out of the Woods yet |
#7
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Stuffed rear derailleur
On 25/01/2011 1:22 PM, F Murtz wrote:
Techo wrote: Becos is incorrect spelling from the USA. It is spelt because, please stop butchering the english language in this country. Becos is not incorrect spelling from the USA. "Spelt" is incorrect If you are going to waste time correcting people you should get it right. In between posting my response to Techo and responding to you, I realised what Techo was really carrying on about I noticed that you had put quotation marks on "Spelt" and after re-reading Techo's post with the quotation marks in the appropriate places, viz "becos" and "because", Techo's post made a bit more sense. Obviously, due to my rather appalling command of the English language, I can neither comment on syntaxual nor grammatical errors in Techo's post. For example, what I call "quotation marks" are, in fact, really known as "rabbit ears" to the greater unwashed like myself. You see, I generally speak with a Westie accent (Liverpool Sydney - Green Valley to be more precise) or an Eastern Surburbs Westie accent (a la Kingsford Sydney - actually, Pagewood and thereabouts). Damn!! I tort .. eeerrr.. sorry .. thought, that he/she/it was objecting to my spelling of "derailleur". Never mind, I got me a free kick against the Lycra crowd |
#8
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Stuffed rear derailleur
On Tue, 25 Jan 2011 06:10:19 +1100, Geoff Lock wrote:
The replacement derailleur didn't have the clamp - it screws onto the dropout(?). If it's got a single bolt coming out of the top then it's the standard from mid-level to top of the range derailleurs. If it's got a metal plate that is clamped by the rear wheel and has a second bolt that threads into a plate in the drop-out, it's cheap. It may still work well despite being cheap, but they're fiddlier. I am not too sure what you mean by an 11-30 cluster - 11T for smallest gear and 30T for largest gear, perhaps? Yep. You can even go out to around 36 as the largest for MTBs with 29" wheels. Standard road bikes tend to be 12-25ish, depending on the bike and rider. Never mind, I am told that I can have a Suntour rear derailleur for my 7-speed for about $40-50. http://www.phantomcycles.com.au/p-85...ed-silver.aspx http://www.phantomcycles.com.au/p-71...ed-silver.aspx I have no relation to that website, other than I've ordered stuff from Kerry a few times and found him to be a really nice bloke and he's quick to get stuff to you. I'm fairly sure I've run 9sp derailleurs with 8sp chains, which are the same as 7sp, but it's been a long time. If those don't look like they've got the right attachment (and if your bike is 40 years old), you might be after something more like the RD-TX31 he http://www.moruyabicycles.com.au/con...r-shimano.html Most bike shops will be able to get them, but may not have them in stock. The expensive derailleurs do tend to shift more reliably with indexing, last longer, and are lighter. They also reduce the weight in your hip pocket quite a bit. -- Dave Hughes - The plural of 'anecdote' is not 'data' - seffala, /. |
#9
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Stuffed rear derailleur
Geoff Lock wrote:
On 25/01/2011 1:22 PM, F Murtz wrote: Techo wrote: Becos is incorrect spelling from the USA. It is spelt because, please stop butchering the english language in this country. Becos is not incorrect spelling from the USA. "Spelt" is incorrect If you are going to waste time correcting people you should get it right. In between posting my response to Techo and responding to you, I realised what Techo was really carrying on about I noticed that you had put quotation marks on "Spelt" and after re-reading Techo's post with the quotation marks in the appropriate places, viz "becos" and "because", Techo's post made a bit more sense. Obviously, due to my rather appalling command of the English language, I can neither comment on syntaxual nor grammatical errors in Techo's post. For example, what I call "quotation marks" are, in fact, really known as "rabbit ears" to the greater unwashed like myself. You see, I generally speak with a Westie accent (Liverpool Sydney - Green Valley to be more precise) or an Eastern Surburbs Westie accent (a la Kingsford Sydney - actually, Pagewood and thereabouts). Damn!! I tort .. eeerrr.. sorry .. thought, that he/she/it was objecting to my spelling of "derailleur". Never mind, I got me a free kick against the Lycra crowd In trying to correct you he was showing his own ignorance. |
#10
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Stuffed rear derailleur
"Geoff Lock" glock@home wrote in message ... Never mind, I am told that I can have a Suntour rear derailleur for my 7-speed for about $40-50. I have a couple of 35 year old suntour derailleurs (large cage and small cage). That would keep you true to the vintage. The large cage is on a bike atm, but I have a shimano 105 derailleur to replace it (to work with some shimano index shifters, and haven't made the time for the change). Probably you'd like large cage. Would be no charge... But could you meet up in Ultimo? Tomasso. |
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