Yup. Only rotate it 180 degrees to take advantage of them.
A 90 degree rotation will defeat their purpose.
A 90 degree rotation will defeat their purpose.
Q: shift ramps and pins on middle chainring ?
I have a silly question here...
When installing a middle chainring that has shift ramps and pins, does it matter at all as to where they're placed, in relation to the direction of where a crankarm is pointed at?
I ask this because I'm thiniking of rotating the ring once in a while (for an even wear), but... In the case of 4-bolt ring like the pic below, the ramps/pins are not evenly spaced per the chainring-bolt holes. (Maybe rotating 180 will probably be the same, but rotating 90 will change the ramp/pin locations in relation to the crankarms.) So, just wondering if that makes any difference in shifting, etc.
Thanks for your feedback in advance,
- PiroChu
When installing a middle chainring that has shift ramps and pins, does it matter at all as to where they're placed, in relation to the direction of where a crankarm is pointed at?
I ask this because I'm thiniking of rotating the ring once in a while (for an even wear), but... In the case of 4-bolt ring like the pic below, the ramps/pins are not evenly spaced per the chainring-bolt holes. (Maybe rotating 180 will probably be the same, but rotating 90 will change the ramp/pin locations in relation to the crankarms.) So, just wondering if that makes any difference in shifting, etc.
Thanks for your feedback in advance,
- PiroChu
Attachments
1 - 9 of 9 Posts
And, just to be sure...
Also, just to confirm, the middlering should be always installed in such a way that the ramps/pins are located like in pic "A" below in relation to crankarms (blue line), not like "B", correct?
Thanks again,
- PiroChu
Thanks, that makes sense.Elzippo said:
Also, just to confirm, the middlering should be always installed in such a way that the ramps/pins are located like in pic "A" below in relation to crankarms (blue line), not like "B", correct?
Thanks again,
- PiroChu
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tabs (x2)
I guess I've never noticed them all these years, while being too preoccupied with the ramp/pin locations...
I'll check mine when I get home...
Thanks much again,
- PiroChu
Thanks for the tip on these two opposing "tabs".Zanetti said:
I guess I've never noticed them all these years, while being too preoccupied with the ramp/pin locations...
I'll check mine when I get home...
Thanks much again,
- PiroChu
Attachments
Are all brands interchangable? (Truvative steel rings on XT crank)
For example, I have a Shimano XT FC-M751 crankset (44-32-22T, 64mm/104mm, 4-bolt). And its original 22T was replaced with a Shimano LX M570/M571 "steel" 22T ring, its original 32T replaced with a Shimano Deore M480/M440 "steel" 32T ring, and its original 44T replaced with Truvative RockGuard bash ring. This combo has been working well.
But, now it's almost time for new chainrings again, and this time I'd like to try Truvativ TruShift "Steel" Ring on my XT crank. I know that they'll simply "fit" fine in terms of size (length/bolt), but I just want to make sure that there possibly won't be any unforeseen shifting problems/glitches (with a certain way Truvative may shape/place its tabs/ramps/pins, if different from Shimano's) with this particular combo. (And I'm using PC-69/971 chain & X.9 rear derailleur & FD-M751 front derailleur.)
Thanks again,
- PiroChu
So, are those "tabs" & "ramps" & "pins" pretty much similarly shaped & located for all brands (ie. Shimano vs Truvative vs Raceface, etc)? Meaning, are they all "mix-and-match" interchangable (so long as the spider length and the bolt count match)?steiny said:
For example, I have a Shimano XT FC-M751 crankset (44-32-22T, 64mm/104mm, 4-bolt). And its original 22T was replaced with a Shimano LX M570/M571 "steel" 22T ring, its original 32T replaced with a Shimano Deore M480/M440 "steel" 32T ring, and its original 44T replaced with Truvative RockGuard bash ring. This combo has been working well.
But, now it's almost time for new chainrings again, and this time I'd like to try Truvativ TruShift "Steel" Ring on my XT crank. I know that they'll simply "fit" fine in terms of size (length/bolt), but I just want to make sure that there possibly won't be any unforeseen shifting problems/glitches (with a certain way Truvative may shape/place its tabs/ramps/pins, if different from Shimano's) with this particular combo. (And I'm using PC-69/971 chain & X.9 rear derailleur & FD-M751 front derailleur.)
Thanks again,
- PiroChu
tab (x1)
Did I previously mislocate the "tab(s)" in my above post (marked by 2 blue rectangular boxes, pointing out the bigger center grooves)?
Was it actually meant as a "single" tab, as in this pic (marked by a green circle), below?
Now I'm confused a bit...
- PiroChu
Just realized something...
Did I previously mislocate the "tab(s)" in my above post (marked by 2 blue rectangular boxes, pointing out the bigger center grooves)?
Was it actually meant as a "single" tab, as in this pic (marked by a green circle), below?
Now I'm confused a bit...
- PiroChu
Attachments
Green circle is a winner
IF you use all Shimano, all RF, all [fill in the blank] rings, you definitely want to arrange the rings so the index is under the crank arm. They've gone through the trouble of designing the ramps and pins to work nicely together so just go with it. If you mix/match brands, you're on your own. I don't think you'll get any guarantees of flawless shifting even if you try all 4 possible orientations of certain rings. Placement of the shifting ramps and pins could be one area of difference between manufacturers - ring thickness and therefore spacing between rings might be another.
Maybe others have some advice about the whole mix/match thing.
That green circle is it - that's the index tab. That is supposed to go under the crank arm.PiroChu said:Just realized something...
Did I previously mislocate the "tab(s)" in my above post (marked by 2 blue rectangular boxes, pointing out the bigger center grooves)?
Was it actually meant as a "single" tab, as in this pic (marked by a green circle), below?
Now I'm confused a bit...
- PiroChu
IF you use all Shimano, all RF, all [fill in the blank] rings, you definitely want to arrange the rings so the index is under the crank arm. They've gone through the trouble of designing the ramps and pins to work nicely together so just go with it. If you mix/match brands, you're on your own. I don't think you'll get any guarantees of flawless shifting even if you try all 4 possible orientations of certain rings. Placement of the shifting ramps and pins could be one area of difference between manufacturers - ring thickness and therefore spacing between rings might be another.
Maybe others have some advice about the whole mix/match thing.
1 - 9 of 9 Posts
