11-spd Modernization of OEM 1996 Cannondale Los Dos
Hi. Am in the initial stages of my planning effort to modernize the drivetrain of my 1996 Cannondale Los Dos Tandem. I'd appreciate input from similar experiences modernizing to a 11-speed mechanical for a C'dale.
Current spec:
My main concerns are:
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I think Shimano freehubs for tandems are 145, so it may fit, or thin the left spacer stack 5mm..
I don't own the tandem you have or a Shimano freehub, like that, but you can search the PDF online of them. how about a Rohloff? 14 speed 36 hole (no dish), 135mm, * can be used with 2 regular cranks, same side drive, rather than the crossover type. * maybe bond 2 2.5mm stainless steel washers inside the frame dropouts, notched like the dropouts .. retrofit kit includes chain tensioner and torque reaction strut.. now several 3rd party offerings to shift it with out the grip shifter. on the bars.. ... |
I'm just about to go through the process of measuring our tandem for double chainrings too. I presume you're keeping thlhs for the timing chain. Don't be tempted to use the Davinci titanium BB with the Davinci cranks as they use a non-standard bearing which isn't easy to source.
Unless you live somewhere very flat I would be looking at a larger cassette. We're going to use an 11- 42 with a Wolftooth roadlink on a eTap WiFli rear derailleur. I'd look at using Velocity Cliffhanger or Blunt 35 if you have enough room. We run Schwalbe Supreme 2.0" tyres for touring on Blunt 35's 26" and they roll really well. |
Originally Posted by Eulers
(Post 20078315)
Hi. Am in the initial stages of my planning effort to modernize the drivetrain of my 1996 Cannondale Los Dos Tandem. I'd appreciate input from similar experiences modernizing to a 11-speed mechanical for a C'dale.
Current spec:
My main concerns are:
|
Originally Posted by Eulers
(Post 20078315)
...Will a 140mm hub and 40-spokes (20/20) properly support use of 11-speed with a 295# husband/wife team?
Do you have a rear drum brake? If not there are some low cost rear hub options for 32H/36H. |
Originally Posted by Eulers
(Post 20078315)
*Will a 140mm hub and 40-spokes (20/20) properly support use of 11-speed with a 295# husband/wife team?
*If I go with Da Vinci cranks, then what do I need to measure on my existing frame so as to spec the front and rear Da Vinci cranksets and bottom bracket?[*] *Will the new Ultegra R8000 mechanical group still shift well when used with the extra long derailleur cable needed for a tandem frame? *What concerns are there for chainline dimensions during this build?[*] *From a standpoint of future-proofing one's investment - What is the potential for the manufacturers to release a roadie 12-speed, for double chainrings, in the next 6-months? [/LIST] The DaVinci cranks use square taper BB to fit 68mm shells, and the arms come in a wide range of lengths. Retail is around $600. The Ultegra R8000 11sp mechanical will be fine with the long cable run. The front shifting will be better than a triple, esp if you use high quality rings with ramps and pins. However, Di2 or eTap will be substantially better than any mechanical drivetrain. Chainline should not be an issue. The cost for R8000 shifters, derailleurs chain, and 11sp cassette is around $500. Shimano is much more likely to introduce a 12sp group for mtn bikes rather than for road bikes. This would be to match the SRAM Eagle 1x12 drivetrain. Some gravel bikes use 1x12 but it's a niche market. Regardless, 11 and 10sp road groups will be around for a long time. It will be hard to find a 11sp rear hub with the old 140mm spacing. Even if you find one, the rear hub (without rim or spokes) will probably cost $300+. |
Isn't the LosDos a flat bar mountain bike?
Has yours got drop bars on it? Is it 3x8 gearing at the moment? |
Thanks, mtseymour, for the info on Da Vinci as I've not been able to raise a response from them. It could be that they're shutdown for the holiday. The 68mm shell info is good to know.
|
Originally Posted by Dean V
(Post 20080649)
Isn't the LosDos a flat bar mountain bike? Yes. Drop Bars are in the plan.
Has yours got drop bars on it? Is it 3x8 gearing at the moment? |
Thanks MrIGH, Tiagra is a good backup plan. I'll keep it in mind.
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Thlhs?
Originally Posted by geoffs
(Post 20079081)
I'm just about to go through the process of measuring our tandem for double chainrings too. I presume you're keeping thlhs for the timing chain.
Don't be tempted to use the Davinci titanium BB with the Davinci cranks as they use a non-standard bearing which isn't easy to source. Unless you live somewhere very flat I would be looking at a larger cassette. We're going to use an 11- 42 with a Wolftooth roadlink on a eTap WiFli rear derailleur. I'd look at using Velocity Cliffhanger or Blunt 35 if you have enough room. We run Schwalbe Supreme 2.0" tyres for touring on Blunt 35's 26" and they roll really well. ** Good tip about Da Vinci! Thanks! ** Locally it is a lot of rolling hills. Vacations are rail trails. Am not averse to switching cassettes for vacation. We always appreciate more range! Mo' is betta! |
Personally if in the end you want a road tandem I would not start with what you have.
I would sell it and get a newer road tandem that already has what you want. |
Seems like the foundational items are (1) the rear hub and (2) the compatibility to the crankset (chainline, etc.) and (3) new Bottom Bracket compatibility with existing frame's shell.
So far I'm trying to get these questions answered but there has been no response the past week or so from DaVinci. It's likely b/c of the holiday for sure with the hub supplier as they told me so. I'll retry mid-Jan when they return. HUB: I have these Questions: MATERIALS:
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In the meantime, until I hear back from Da Vinci and TandemsEast, I'll double check the benefit vs cost story using the suggestions from MrIGH (Tiagra 10v) and DeanV (newer tandem).
|
Do you know what gearing range you need to suit your riding?
It needs to be considered as well before deciding on components. |
Originally Posted by Eulers
(Post 20078315)
Hi. Am in the initial stages of my planning effort to modernize the drivetrain of my 1996 Cannondale Los Dos Tandem. .......
On our T50, we went from the original 3 x 7 to a 3 x 9 because: * the rims split along the brake track. * neither I nor the LBS could get the Sun Tour cassette of the Sansin hub. The LBS broke two chain whips trying. I don't think that the original owner ever took it apart and that it was not adequately greased originally. Benefits: wider range across each chain ring; and slight closer ratio spacing. I used a Wheelmaster 135mm tandem hub with a 2mm precision shim (washer style) on each side. The Wheelmaste hub has a 15mm axle, with 10mm nubs on each side that slide into standard drop outs. It's construction is very similar to Phil Wood's. It is available in 36H, 40H and 48H. Might be in 32H too - I have looked. It has an 8/9/10 speed steel freehub - which I believe works with 11 speed road cassettes - but not positive. We did not change the 28-44-54 chain rings. The rear went from 12-28 to 11-34. 12-36 might have been a better choice. Since then I got a 26T granny. |
On a recent thread ( https://www.bikeforums.net/bicycle-m...ad-triple.html )
under reply #8 there was mention that Shimano's latest 11 spd cassette, the 8000 series Ultegra 11-34 is back compatible with 10 spd hubs sort of like the 11 spd MTB cassettes being compatible with 10 spd hubs. Researching this gave some incomplete data but may be worth exploring, as a way to keep your present wheelset (ie some Shimano sites show no 11-34 11spd, others do but no other info). The 8000 series Ultegra 11 spd RD can go to 11-36 as is and likely to 11-42 with a Wolf extender. There have been a number of posts about the electric SRAM and Shimano RD being pushed 4 teeth larger on the cassette than their nominal max. No reason this would not apply to the mechanical RD as well and the 8000 series Ultegra is clearly designed for larger cassettes than the 6800 series. |
Originally Posted by sch
(Post 20084417)
On a recent thread ( https://www.bikeforums.net/bicycle-m...ad-triple.html )
under reply #8 there was mention that Shimano's latest 11 spd cassette, the 8000 series Ultegra 11-34 is back compatible with 10 spd hubs sort of like the 11 spd MTB cassettes being compatible with 10 spd hubs. Researching this gave some incomplete data but may be worth exploring, as a way to keep your present wheelset (ie some Shimano sites show no 11-34 11spd, others do but no other info). FH-6800 |
Originally Posted by Eulers
(Post 20083562)
In the meantime, until I hear back from Da Vinci and TandemsEast, I'll double check the benefit vs cost story using the suggestions from MrIGH (Tiagra 10v) and DeanV (newer tandem).
- I kept the original cranks and mounted modern Shimano 10 speed chainrings from 105 crankset (53/39/24). Cost was ~$50 total (ebay). Setting up a tandem with Ultegra crankset isn't going to be easy or cheap. For that matter, anything except your stock cranks is going to be expensive. - I bought Tiagra 4603 shifters off ebay that are brand new in OEM bags for $110. I like them because they have the window for chain position (nice to have on a tandem) and external shift cables to help with the extra long rear derailleur cable friction. Also, Tiagra 4603 shifter should work with low-cost 7-8-9 speed MTB derailleurs (of which I have several in my spare parts bin). The Tiagra 4703 have hidden shift cables, lack the chain position window and need a special version rear derailleur. Anything 2x11 requires an 11 speed rear derailleur. - I stayed with 10 speed so I could use low cost rear hubs. I bought a set of 40H Shimano HF-08 for $180. If I wasn't stuck with 160mm spacing and a rear drum brake I'd just buy 32H Shimano XT 756 rear hub and install a steel axle and 5mm of spacers. I'm building new wheels so I can run 35mm tyres on wider rims. I'm selling the old skinny tyre wheelset because it's cheaper in the end. |
Originally Posted by Mr IGH
(Post 20085402)
I'm upgrading a 1998 Santana Arriva from 8 speed to 10 speed (and customizing bars/stem/saddles/pedals). Here's the path I took to keep my costs low. I'm not a fan of 2x11, I prefer triples for my own reasons (and choose not to discuss my reasons here on BF ;) ).
- I kept the original cranks and mounted modern Shimano 10 speed chainrings from 105 crankset (53/39/24). Cost was ~$50 total (ebay). Setting up a tandem with Ultegra crankset isn't going to be easy or cheap. For that matter, anything except your stock cranks is going to be expensive. - I bought Tiagra 4603 shifters off ebay that are brand new in OEM bags for $110. I like them because they have the window for chain position (nice to have on a tandem) and external shift cables to help with the extra long rear derailleur cable friction. Also, Tiagra 4603 shifter should work with low-cost 7-8-9 speed MTB derailleurs (of which I have several in my spare parts bin). The Tiagra 4703 have hidden shift cables, lack the chain position window and need a special version rear derailleur. Anything 2x11 requires an 11 speed rear derailleur. - I stayed with 10 speed so I could use low cost rear hubs. I bought a set of 40H Shimano HF-08 for $180. If I wasn't stuck with 160mm spacing and a rear drum brake I'd just buy 32H Shimano XT 756 rear hub and install a steel axle and 5mm of spacers. I'm building new wheels so I can run 35mm tyres on wider rims. I'm selling the old skinny tyre wheelset because it's cheaper in the end. But if you were desperate for 11sp double without spending too much I would, - get 11sp cassette and turn 0.070" out of the back. It will then fit your existing wheel. - New chainrings on your existing cranks. Leave off granny ring. Just not sure if the spacing between chainrings would be too much. - New, shorter BB at the back to correct chainline. Maybe not essential. Need to make sure new front mech has enough reach too. |
Originally Posted by Eulers
(Post 20083562)
In the meantime, until I hear back from Da Vinci and TandemsEast, I'll double check the benefit vs cost story using the suggestions from MrIGH (Tiagra 10v) and DeanV (newer tandem).
Yes I know it's been years since the last post. |
Originally Posted by Eulers
(Post 20078315)
Hi. Am in the initial stages of my planning effort to modernize the drivetrain of my 1996 Cannondale Los Dos Tandem. I'd appreciate input from similar experiences modernizing to a 11-speed mechanical for a C'dale.
Current spec:
My main concerns are:
|
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