40/42 tooth Rear XT cassette 'bodge'

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  • 40/42 tooth Rear XT cassette 'bodge'
  • mrbelowski
    Member

    Braver man than me. What could possibly go wrong? 🙂

    Premier Icon teamslug
    Subscriber

    As far I can see absolutely nothing!!!

    Premier Icon teethgrinder
    Subscriber

    Sounds like an interesting idea. I dropped the 15 on mine, but it’s a bit od a jump down to the 13. I rarely use the 11, so might give this a try.

    Premier Icon tmb467
    Subscriber

    a 34t chainring with 13/40 is comparable to running a 30t chainring and 11/36

    so just change yer front ring shirley?

    34:13 = 69.1″
    34:40 = 22.4″

    30:11 = 72″
    30:36 = 22″

    Premier Icon D0NK
    Subscriber

    hmm 11 to 13 looses* you about 3mph from your top speed with a 32 front, not sure I’d want to give that up but may be worth a try I guess.

    30:11 = 72″
    30:36 = 22″

    quick google, nope not quite low enough range, would have been cheaper than 32×11-36 + 42. Ah well.

    *is cougar around?

    Premier Icon teamslug
    Subscriber

    Thought I’d share this with the STW massif…Got a hope T rex 40 tooth last week and didnt really want to take the 17 tooth cog out and have the split in ratios so I had a mess around and have come up with a fix that allows you to take off the 11 tooth bottom cog and still use the original lockring. I used a plastic frame spacer from a shimano external bottom bracket and cut a small section out of it and then forced it into the small groove on the 13tooth cog (which was originally gear number 9 of 10). This allows the lockring to sit against it and tighten into the freehub body. The spacer is sat on the metal rim so wont push through. Just been out and done 50 miles off road around Wharncliffe and surrounding area and its been fine. I am going to put a bit of nut lock on the lockring as it doesnt have the serrated edge of the 11 tooth to bite into( i torqued it up to recommended). Running 1 x 10 with a Wolf Tooth thick thin on front and it didnt miss a beat thru some crappy condtions. Sorry for long winded explanation!!!.

    This doesn’t seem to make much sense! 13:40 is a smaller spread of ratios than 11:36 – and the cassette is heavier and more expensive.

    iffoverload
    Member

    I used individual sprockets to get ratios I liked, the big jump is on the shift from 4th to 5th @ 20t- 26t. on a 9 speed 11-40

    Premier Icon chickenman
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    Blimey, there is a worrying lack of basic maths knowhow out there… 😯
    11 to 13 is a 22% loss off the top. 36 to 42 is a 17% gain at the bottom. All could be achieved with less cost and shifting issues by running a smaller chainring…

    Premier Icon timmys
    Subscriber

    LOL, I wondered when this was going to surface again as it did when the 40/42 rings first appeared! Congratulations on making a smaller range cassette than you started with.

    mrbelowski
    Member

    Seems reasonable enough if you can’t go any smaller up front – don’t think you can got lower that 30t on most 104BCD cranksets

    Seems reasonable enough if you can’t go any smaller up front – don’t think you can got lower that 30t on most 104BCD cranksets

    Why not just use the inner ring position of a double crankset?

    mrbelowski
    Member

    cos I don’t have a front mech or shifter. Anyway, I’m planning to ditch the 17T, not the 11T, so I don’t know why I keep banging on about it 🙂

    My point was that you can run 1×10 using a middle ring of a 3x, the outer ring of a 2x or the inner ring of a 2x – which allows you to run a huge range of chainring sizes. But I see no point in paying for a range extender big sprocket if you then remove the 11t sprocket instead of taking a mid-sized sprocket out!

Viewing 14 posts - 1 through 14 (of 14 total)

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