derailluer mount questions
10-01-12, 08:27 AM
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derailluer mount questions
my new to me gt arrette has an old (ugly altus c90 derailures), the jockey wheels feel rough even after taking them apart and greasing them
questions
the front is an e type
can I just use a "clamp on" of the right diameter clamp (or with shims if needed) the seat post is a 26.8 so it would be a smaller size clamp
Would I need to remove the e type clamp?
Can I just cut it off with a dremel?
do I need to remove the BB?
the rear derailleur looks like it has a long hanger. "or maybe the pivot is not part of the hanger" it does bolt directly to the frame but the only current shimano that looks like this is the tourney
even the altus's hole look like it is shorter or the bole for the hanger is through the pivot. can the be used instead
or can I not see the pivot an I am only seeing the mount
questions
the front is an e type
can I just use a "clamp on" of the right diameter clamp (or with shims if needed) the seat post is a 26.8 so it would be a smaller size clamp
Would I need to remove the e type clamp?
Can I just cut it off with a dremel?
do I need to remove the BB?
the rear derailleur looks like it has a long hanger. "or maybe the pivot is not part of the hanger" it does bolt directly to the frame but the only current shimano that looks like this is the tourney
even the altus's hole look like it is shorter or the bole for the hanger is through the pivot. can the be used instead
or can I not see the pivot an I am only seeing the mount
10-01-12, 08:49 AM
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Yes, you can use a clamp on derailleur, as long as the pull direction is correct (many work either top or bottom pull). You also want to be sure that if it's road, compact or mtb specific that it matches the cranks.
As far as the RD goes, use any model that you prefer. the long tongue at the top of your Altus is part of the derailleur, the actual hanger is standard.
As far as the RD goes, use any model that you prefer. the long tongue at the top of your Altus is part of the derailleur, the actual hanger is standard.
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10-01-12, 08:54 AM
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I assume you mean the clamp diameter should be 28.6 mm, not 26.8. 28.6 mm is 1-1/8" and is a standard steel bicycle tube diameter for older frames.
10-01-12, 09:19 AM
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is the actuation the same for road and mtb. how important is it that I match the big chain ring size (will one designe for a 52 work just fine with a 48 it should be able to get low enough.
do I need to worry about high mount vs low mount I don't think so
this will open up my ebay options if I can use sora or 105 as well as the mtb stuff.
is it likely I will need to grind/ cut or remove the old e type. ( griding means I wont need to source a spacer right)
are shims of on the clamp
As far as the RD goes, use any model that you prefer. the long tongue at the top of your Altus is part of the derailleur, the actual hanger is standard.
10-01-12, 09:23 AM
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You have o get rid of the old mount since it'll be in the way. You can either grind it off near the BB, or take the BB apart and remove it entirely. I don't believe you'll need to replace it with a spacer, but you might.
As far as pull ratios, I don't follow Shimano that closely (Campy/old Suntour), but Hillrider or someone else will confirm that either way.
As far as pull ratios, I don't follow Shimano that closely (Campy/old Suntour), but Hillrider or someone else will confirm that either way.
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10-01-12, 10:02 AM
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Shimano's road and MTB front derailleurs do not have the same actuation ratios and should be matched with corresponding shifters if you are using indexing. This is particularly necessary with a triple crank. With friction shifters it doesn't matter.
You can use a front derailleur made for a 52T big ring with a 48T ring if you mount it with the proper clearance but a MTB front derailleur intended for a smaller big ring (44 or 42 typically) will have too sharp a curvature to work at all well with a large ring.
You can use a front derailleur made for a 52T big ring with a 48T ring if you mount it with the proper clearance but a MTB front derailleur intended for a smaller big ring (44 or 42 typically) will have too sharp a curvature to work at all well with a large ring.
10-01-12, 10:05 AM
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Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
10-01-12, 11:26 AM
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10-01-12, 11:31 AM
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Pretty sure you won't need a spacer; if you do, you're in a much better position to turn the bracket into a spacer with it removed.
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Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
10-01-12, 11:36 AM
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You can use a front derailleur made for a 52T big ring with a 48T ring if you mount it with the proper clearance but a MTB front derailleur intended for a smaller big ring (44 or 42 typically) will have too sharp a curvature to work at all well with a large ring.
but I am not changing the cranks anytme soon. and the rings are riveted so they stay untill the are worn out.
Last edited by scooterfrog; 10-01-12 at 11:42 AM.
10-01-12, 11:40 AM
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It's annoying how FDs aren't as modular as RDs like that...
Notice this RD?
Notice this RD?
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Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
10-01-12, 11:44 AM
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10-01-12, 11:44 AM
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10-01-12, 11:47 AM
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It's a Deore with a road cage, just to be different 
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Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
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