6 speed freewheel hacks?

[doctor-bond]

So I’ve got a Shimano MZ hyperglide 6 speed freewheel on my, ahem, gravel bike: these max out at 28t and don’t appear to be crackable. They’re great though.

And while I don’t need 40t at the rear because I’ve got a 26t ring up front, 30 would t hurt and I’m curious to know if it’s possible to contrive a 6sp freewheel with customisable hyperglide cogs (hyperglide being prolly the best invention since the slant parallelogram derailleur). Maybe using Sachs, sunrace, etc?

Anyone know?

Gravel

 

[Rod_Saetan]

Suntour and Regina are your best bet for custom ratios with 30t+ on a 6 speed block. Fully rebuildable and sprockets available separately, I suspect it would be neither easy or cheap though!

 

[bikeworkshop]

Shimano Mf-tz30 6 speed tourney did 14-34,
although if you're not using one of the tourney Megarange dérailleurs
(and you wouldn't really want to)
you might need to choose your r.mech carefully - some can be adjusted to handle 34, some can't.

If its all shimano, the indexing should be spot on.

 

[doctor-bond]

Yes, the changeability of Suntour cogs (and Malliard) is what I’m after but with those lovely hyperglide ramps. Mega range is an option but the 6 speed ones seem to jump from 23 to 34.

Is there a way to crack these? Looks like the small one might screw and then the first few slot on with the last three on a carrier? Could then mix and match 7 speed cogs onto 6 speed wheel body perhaps.

…. Edit, but if you can’t crack the carrier, then you’re stuck with the big final step…..