Forgot to mention I will be buying the 2021 version of the same bike instead, identical specs, just different color. So regarding your observation you can see the clearance at 2:01 , 2:25 , 2:37 and 4:32 of this YT video, so it does look like the sales person (I dislike sales people but that's a different story) is right.
Going from dual to triple crankset
Re: Going from dual to triple crankset
Re: Going from dual to triple crankset
Not an option with Hollowtech II chainsets.
The fitted chainset is Boost standard with a 53mm chainline. Boost was introduced to allow chainstays to be widened to accommodate wider tyres by increasing the chainline and using only 1x or 2x chainsets. Triple chainsets are all non-Boost, and the inner ring in particular may be very likely to foul on the chainstay of a frame designed around the Boost standard. Even if the chainset can be fitted, the different designed front and rear chainlines may affect shifting performance.
Re: Going from dual to triple crankset
Thanks for the reply. The new chainset I'm looking at (FC-T6010) is also Hollowtech II and the Q factor is +3mm (so maybe half of that on the drive side) and chainline +1.2mm which is a small difference so I don't know what effect that would have on shifting, probably not noticeable?slowster wrote: ↑8 Aug 2022, 12:02pm Not an option with Hollowtech II chainsets.
The fitted chainset is Boost standard with a 53mm chainline. Boost was introduced to allow chainstays to be widened to accommodate wider tyres by increasing the chainline and using only 1x or 2x chainsets. Triple chainsets are all non-Boost, and the inner ring in particular may be very likely to foul on the chainstay of a frame designed around the Boost standard. Even if the chainset can be fitted, the different designed front and rear chainlines may affect shifting performance.
Regarding the inner ring touching on the boost frame issue, looking at Sehlon Brown's page there is an image that shows how the chainline is defined on a double and on a triple crankset. If that image is correct, the +1.2mm (i.e. bigger) chainline difference means the smaller chainring may just about fit in there? If the standard space between chainrings is 5mm (is that true?) then the smaller chainring will sit 1.3mm inwards on the new triple crank compared to the original (5mm halved, minus1.2mm)
Re: Going from dual to triple crankset
I was mistaken about the fitted chainset being Boost standard (it is only the 1x version of FC-5100 that has a 52mm chainline, and as you note the chainline of the double is 48.8mm).
I *think* the chainring spacing could be more than 5mm, possibly nearer 8mm. If so, the 36t middle and 26t inner rings of the triple could be up to 3mm further inboard than the 36t outer and 26t inner rings respectively of the fitted double chainset*.
* 48.8mm chainline of the double chainset + 8mm/2 = ~53mm (vs. the 50mm chainline of the triple)
I *think* the chainring spacing could be more than 5mm, possibly nearer 8mm. If so, the 36t middle and 26t inner rings of the triple could be up to 3mm further inboard than the 36t outer and 26t inner rings respectively of the fitted double chainset*.
* 48.8mm chainline of the double chainset + 8mm/2 = ~53mm (vs. the 50mm chainline of the triple)
Re: Going from dual to triple crankset
FC T6010 https://bike.shimano.com/en-US/product/ ... T6010.html
....chainline is 50mm according to that....
ie middle ring 50mm from frame centreline.
FCM 5100 -2 https://bike.shimano.com/en-US/product/ ... 100-2.html....apparently for frames with 135, 142,OLN..
48.8mm chainline... from centre of gap between rings to frame centre
FCM 5100 B2...https://bike.shimano.com/en-US/product/ ... 00-B2.html....148 OLN
....chainline 51.8mm.....as above....frame centre to centre of gap between rings.
i need to lie down now!
....chainline is 50mm according to that....
ie middle ring 50mm from frame centreline.
FCM 5100 -2 https://bike.shimano.com/en-US/product/ ... 100-2.html....apparently for frames with 135, 142,OLN..
48.8mm chainline... from centre of gap between rings to frame centre
FCM 5100 B2...https://bike.shimano.com/en-US/product/ ... 00-B2.html....148 OLN
....chainline 51.8mm.....as above....frame centre to centre of gap between rings.
i need to lie down now!
Bike fitting D.I.Y. .....http://wheel-easy.org.uk/wp-content/uploads/bike-set-up-2017a.pdf
Tracks in the Dales etc...http://www.flickr.com/photos/52358536@N06/collections/
Tracks in the Dales etc...http://www.flickr.com/photos/52358536@N06/collections/
Re: Going from dual to triple crankset
I am now in possession of the bike and as you can see here there is plenty of clearance for the FC-T6010 crankset , I believe the inner chainring will move about 2mm inwards.
I have a question about the new front derailleur. The current deraileur is clamp on, high clamp/bottom swing, bottom pull, so I thought the new one should have the exact same specifications and this deraileur seems to tick all the boxes. Can you verify it will fit? I believe it is dual pull compatible. Many thanks
I have a question about the new front derailleur. The current deraileur is clamp on, high clamp/bottom swing, bottom pull, so I thought the new one should have the exact same specifications and this deraileur seems to tick all the boxes. Can you verify it will fit? I believe it is dual pull compatible. Many thanks
Re: Going from dual to triple crankset
Specifications are here....https://bike.shimano.com/en-US/product/ ... 0-H-3.html
Mostly these need to agree with the chainset specifications**; the exception is "chainstay angle" which is a frame dimension
** number of chainrings....3....check
Chainline ....I think 50mm both?
tooth numbers of rings .....difference big ring to middle ring is important.
Number of "speeds"....both 10 I think?
Mostly these need to agree with the chainset specifications**; the exception is "chainstay angle" which is a frame dimension
** number of chainrings....3....check
Chainline ....I think 50mm both?
tooth numbers of rings .....difference big ring to middle ring is important.
Number of "speeds"....both 10 I think?
Bike fitting D.I.Y. .....http://wheel-easy.org.uk/wp-content/uploads/bike-set-up-2017a.pdf
Tracks in the Dales etc...http://www.flickr.com/photos/52358536@N06/collections/
Tracks in the Dales etc...http://www.flickr.com/photos/52358536@N06/collections/
Re: Going from dual to triple crankset
Yes, 10, top-mid tooth difference is 12T, also check. The only issue is here, the current distance between the derailleur and the bottle mount is 29mm (not 2.9mm) so not sure if I should get high clamp or low clamp aka bottom swing or top swing, the FD-T8000 comes in both versions. The high clamp may sit just above the bottle mount which would be fine, or maybe not?
Re: Going from dual to triple crankset
46T chainring is about 195mm diameter....that might help your decision if you make some assumptions about the dimensions of the potential new front mech.
The low clamp mechs. don't seem to last as well as the traditional ones before the pivots go sloppy.
If you buy stuff on line, most people seem OK to take it back if it doesn't suit, always provided it looks new.
The low clamp mechs. don't seem to last as well as the traditional ones before the pivots go sloppy.
If you buy stuff on line, most people seem OK to take it back if it doesn't suit, always provided it looks new.
Bike fitting D.I.Y. .....http://wheel-easy.org.uk/wp-content/uploads/bike-set-up-2017a.pdf
Tracks in the Dales etc...http://www.flickr.com/photos/52358536@N06/collections/
Tracks in the Dales etc...http://www.flickr.com/photos/52358536@N06/collections/
Re: Going from dual to triple crankset
How did you get on with this conversation? I have the same bike and want to do the same as you, also noticed your thinking of changing your wheels ? If so I might be interested in buying your originals as spares if your going to part with them.
Re: Going from dual to triple crankset
I would probably look to convert the extant double to a (very) non-standard 26-36-46 triple. The usual pitch of triple (and double) chainrings, is ~8mm. If you reduce this to about 6mm it'lll probably fit and work OK, but you won't be able to run some of the small-small cross-chained combinations any more. You probably will need to re-machine the extant crank; it may be possible to do this in-situ using a variant of the SG method in combination with a wooden fixture. You will also have to modify a front mech so that it moves a bit less far than normal; not difficult, in many cases using a simple am extension.. This is undoubtedly a lot of work, but the end result could be a 26,36,46T triple that fits and works better than anything you can buy.
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~