Leonardi Factory “General Lee” 25T – 40T Ten Speed Mountain Bike Cassette Adapter

Leonardi Factory General Lee 25-40 tooth 10-speed mountain bike cassette adapter
Photo: Alex Boyce / i-MTB.com

Like the idea of a wide-range single chainring drivetrain but don’t want to drop the coin for a new XX1 group?

Leonardi Factory has a solution with their 25-40T cassette adapter. It ramps up the tooth counts over the last four cogs, giving you a much larger range and lower gearing for climbing, and the part simply replaces the last section of your stock 10-speed cassette.

Word is it shifts well thanks to ramped, machined teeth, with the expected odd jump in cadence and effort between them. i-MTB and Bagnoli Bike have been testing it and report that it works quite well with SRAM derailleurs by adjusting the B-tension screw appropriately. Cassette adapters are available for both SRAM and Shimano cassettes. They’re also reporting it ends up a bit lighter than the standard cassettes!

We couldn’t find a website for Leonardi, so anyone in the know, please drop some knowledge in the comments!

Comments

33 thoughts on “Leonardi Factory “General Lee” 25T – 40T Ten Speed Mountain Bike Cassette Adapter

  1. They are mostly known as Leonardi Racing, not Leonardi Factory. So try searching for “Leonardi Racing” instead. You may be surprised with your findings… 😉

  2. Looks like turdpoop. Another article says “on the stand the system worked well”. Wondering how long a chain lasts when under load of rider and suspension action of a rear forked bike
    . Looks very much like the cassettes found on those fancy comfort bikes. This crap is destined for a big fat zero point zero!!!!!!

  3. looking at their store, they’ve got some crazy sculpted stems (very pricey, though). Their carbon panels for the Scapel are nice too. The RD self-oiling system on the other hand…don’t know about that one.

  4. Not so sure about this one either, but @dwiz … what exactly is a “rear forked bike”, and what does the afformentioned forking of the rear of the bike have to do with drivetrain durability? Educate us please.

    Hey

  5. The day I need a 40T cog to get up a hill is the day I sell my bike and become a couch potato. Seriously, why would anyone ever need a 40T, especially with MTB granny gears being in the mid-20T range?

  6. “The day I need a 40T cog to get up a hill is the day I sell my bike and become a couch potato. Seriously, why would anyone ever need a 40T, especially with MTB granny gears being in the mid-20T range?”
    Aaron, if you had mountains for your biking and a 32th XX1 ring up you might like a forty ring on the cassette. or you could walk up the hill at the back with me. we could talk about why you are so closed up and tight about new drivetrain options.

  7. It seems that most people don’t actually read even the very first text lines of this post…
    and start wondering about God knows what…

    “Like the idea of a wide-range single chainring drivetrain but don’t want to drop the coin for a new XX1 group?

    Leonardi Factory has a solution with their 25-40T cassette adapter.”

  8. I don’t know, I’m thinking if I need a 40t in back that I might be better off sticking to a more traditional set up in the front.

  9. A very interesting option to the XX1 group. Would be perfect to have a complete Leo-cassette with 10-40T (9-40T) and a XX1 crank with 28T in front.

  10. If you really want some crazy range, combine this with the Canfield Brothers 9t Microdrive system and create a 9-40t rear casette.

  11. This makes perfect sense depending on where you ride. If the rear shifting isn’t compromised much and having the ability to get rid od a front derailleur and go single makes all the sense in the world. Now with so many bakes having dropper seat post with a lever on the handlebar, lockouts another lever a bike could have more tubes and cables coming out of the front of it than someone on life support. Getting rid of one of those cables makes it perfect. I’m only curious how bad is he jump in effort when you shift to that first gear on the Leo set.

  12. My concern is that the 2 smaller gears will wear out in one season because they are made of aluminum and those are the two I will be riding in the most. Considering the high price I will have to pass. However, it shows that 40 teeth will work on a ten speed system. If someone would make a Shimano/Sram style and quality 40 tooth 10sp cassette they would sell thousands.

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