Is a 11 speed road cassette on 8-10 speed road hub not compatible?

[otherself]

Got my first 11 speed groupset recently (shows you how outmoded I am) sensah empire to build to a new BXT branded carbon roadie frame.

Cassette body on my old 8-10 speed planet X wheels (circa 2010) doesnt appear wide enough to accept the 11 speed cassette of the new group.

Will I need to get a new freehub body? Which given the age of the wheels looks unlikely.

 

[grantoury]

The new 11 speed shimano hubs have a wider cassettebody

 

[Peachy!]

You might have more joy swapping out the whole hub.

 

[otherself]

You might have more joy swapping out the whole hub.

Bummer.

The new 11 speed shimano hubs have a wider cassettebody

I thought so. By 1.8mm it seems.

 

[slackboy]

Cassette body on my old 8-10 speed planet X wheels (circa 2010) doesnt appear wide enough to accept the 11 speed cassette of the new group.

If you get a non series 11-34 11 speed cassette (hg600 I think) hg800 then that is the standard mtb 11 speed spacing that will fit on 8-10 speed freehub.

You have to use a spacer when fitting them to a road 11 speed freehub.

Shimano Ultegra HG-800 11-34T cassette review: Adventure-sized - CyclingTips

As the definition of road riding forever broadens, so has the demand for product outside of what racers typically use. Whether it’s to conquer an obscenely long ride, tackle an alpine weekend away, or take your drop-bar bike where a mountain bike would be better suited, the thirst for lower and...

cyclingtips.com

 

[Splatter Paint]

The new 11 speed shimano hubs have a wider cassettebody

What he said ^^

 

[Sketchyxup]

11 Speed mtb cassette might go on as long as it clears the spokes i.e. you dont go massive with the cog size.
11 speed road cassettes require the longer freehub body, 11 speed mtb cassettes fit on a 10speed freehub body. Strange but true.

 

[pigman]

You could just fit the biggest 10 sprockets on your existing wheels for now till youre ready to buy new wheels. You'll have a redundant click, but itll work

 

[latman]

the narrower freehub body MAY be able to get machined down 1.8 mm , or the back of the cassette milled out 1.8 mm , how it works depends on the geometry of the drive side spokes

 

[thepedaller]

Yes I've done the above and had a 11-32 Shimano 105 cassette machined down. See attached pic I had this done by bomber bike works. Works like a treat.