Shimano 11 spd on MTB 10 spd freehub

[donevwil]

I'm out of my element here (10 spd Campy guy) and a buddy bought a new disc gravel bike with Ultegra 11 spd and a 700c wheelset. He's interested in adding a 650b wheelset and I've offered him mine built with 10 spd XT hubs.

What do we need to know?

- Would he have to live with a Shimano MTB 11 spd cassette of 11-40 or greater? Any options with a large cog in the 30's?
- Would he need to add a goat link?
- Would he need a longer cage or MTB rear derailleur?
- Just avoid this scenario and get a wheelset built with 11 spd hubs?

Thanks in advance.

[jtbadge]

Shimano sells an 11-34 cassette in the Ultegra R8000 (CS-HG800) and 105 R7000 (CS-HG700) series that is designed specifically for this application. If he has a GS (medium) cage rear derailleur, even 6800/5800 series, no other modifications would be needed, outside of a correctly sized chain.

[donevwil]

Originally Posted by jtbadge

Shimano sells an 11-34 cassette in the Ultegra R8000 and 105 R7000 series that is designed specifically for this application. If he has a GS (medium) cage rear derailleur, even 6800/5800 series, no other modifications would be needed, outside of a correctly sized chain.

... and there you have it folks. Thank you jtbadge, this place is awesome.

[jtbadge]

This also presumes your hubs have the same axle standards as his frame - QR front/rear, 12mm front, 15mm front, 12mm rear, etc.

[donevwil]

Originally Posted by jtbadge

This also presumes your hubs have the same axle standards as his frame - QR front/rear, 12mm front, 15mm front, 12mm rear, etc.

Yup, 15mm x 100mm & 12mm x 142mm. That's why I offered them up, I have a new frameset with 12mm x 100mm in the queue.

[donevwil]

OK, touched base with my buddy and he DOES want to run an 11-40. With that in mind, what does he need (yes he currently has the GS medium rear der.).

[dougefresh]

one of these:
https://www.wolftoothcomponents.com/...ducts/roadlink

or

a shimano 11s MTB derailleur and one of these:
https://www.wolftoothcomponents.com/...roducts/tanpan

[donevwil]

Originally Posted by dougefresh

one of these:
https://www.wolftoothcomponents.com/...ducts/roadlink

or

a shimano 11s MTB derailleur and one of these:
https://www.wolftoothcomponents.com/...roducts/tanpan

Thanks!

So the Roadlink will allow him to run the 11-40, but to go larger he'd need the MTB rear and Tanpan correct?

How does the Roadlink setup perform when paired with a road cassette?

[oldpotatoe]

Originally Posted by jtbadge

Shimano sells an 11-34 cassette in the Ultegra R8000 (CS-HG800) and 105 R7000 (CS-HG700) series that is designed specifically for this application. If he has a GS (medium) cage rear derailleur, even 6800/5800 series, no other modifications would be needed, outside of a correctly sized chain.

BUT to answer your question, except for those 2 ‘road’ cogsets, an 11s cogset won’t fit onto any 10s shimano/sram MTB FHB.

[nublar]

Originally Posted by oldpotatoe

BUT to answer your question, except for those 2 ‘road’ cogsets, an 11s cogset won’t fit onto any 10s shimano/sram MTB FHB.

Sunrace makes quite a few 11 speed cogsets that work on 10s mtb. I'm running an 11-36 with my Ultegra RX FD.

[nublar]

Originally Posted by donevwil

Thanks!

So the Roadlink will allow him to run the 11-40, but to go larger he'd need the MTB rear and Tanpan correct?

How does the Roadlink setup perform when paired with a road cassette?

You might be able to get away with 11-40 with an RX, R7000 GS, or R8000 GS rear.

[jtbadge]

Originally Posted by nublar

You might be able to get away with 11-40 with an RX, R7000 GS, or R8000 GS rear.

Presuming 1x drivetrain, probably so. I'd think it would be too much chain to tension if also accounting for multiple chainrings.

[MaraudingWalrus]

and for others searching out information, for those who want to get really wacky, Rotor's 11speed 11-28 cassette fits on 10sp s-group freehubs.

[Look585]

Ultegra 8000 and 8050 GS (and presumably the 105 7000 GS) will clear the 11-40 cassette on many bikes without the addition of a WolfTooth RoadLink extender.

If he has the GS rear mech already, give it a try before adding the RoadLink.