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29er 3x7 to 1x7/8 speed conversion

jsisidorejsisidore Posts: 122
edited July 2017 in MTB buying advice
Since I already don't have a front mech and probably never will I decided to go 1x, but having a 2x and shift manually is not an issue either :lol: I do like the idea of having all the gears on the back...

What gives me a headache is deciding what length and size I should go for. My current setup is 14/28 and 28/38/48 170mm. I really like 48t and don't need more but more than often switch to 38t and remember to switch back only on a long strip of flat surface which is not that common where I live.

So I'm thinking of finding a middle ground between 48t and 38t, but Ideally I would want a 32/46 and the middle between the two would be 40t which is a little bit on the small side, I need the bigger wheel more so I would compromise towards 42t and 180mm for more leverage if that makes sense.

And in the future get a new cassette, something like 11/34... sadly I can only get away with a 8-9 speed cassette on my current frame and since I already upgraded to 8 speed shifter and rear mech I'm not looking forward to converting again for the sake of an additional gear.

Posts

  • jsisidorejsisidore Posts: 122
    I used the bikecalc ratio calculator and with a 11/34 cassette I would say I'm down with anything between 36t and 42t
  • jsisidorejsisidore Posts: 122
    Also there's a lot of fixie/singlespeed cranksets on the market, I suppose there's no difference between these and those marketed 1xN ?

    p.s. I would prefer a two-piece system.
  • cyclecliniccycleclinic Posts: 6,865
    for off road use a narrow wide chainring is useful but single rings bigger than 38T are not common for MTB chansets.

    With a 29er a 38:11T is a ration for high paced road use. I have that ratio as a top gear on my 29er and it is for speeds over 20 mph.
    http://www.thecycleclinic.co.uk -wheel building and other stuff.
  • jsisidorejsisidore Posts: 122
    for off road use a narrow wide chainring is useful but single rings bigger than 38T are not common for MTB chansets.

    With a 29er a 38:11T is a ration for high paced road use. I have that ratio as a top gear on my 29er and it is for speeds over 20 mph.
    I'm fine with 38/36:11/12

    Thing is single speed chainsets are cheaper so I'm thinking they are not as durable as the ones marketed as mtb? So far I think a chainset is the most confusing part on a bike.
  • The RookieThe Rookie Posts: 27,761
    If you use a plain ring you'll need a chain guide, use a narrow wide ring and you won't.

    Use an MTB crankset and you'll be limited to about a 38t, use a road crankset and you can get upto a 44t cyclocross ring which is what I'm using on my commuter.
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.9Kg
  • jsisidorejsisidore Posts: 122
    I found shimano alfine 39t 170mm with bb on amazon quite cheap so I went with it. It's almost exactly what I wanted. Originally I was looking at Truvativ Hussefelt 1.1 DH but it was overkill for my needs.
  • The RookieThe Rookie Posts: 27,761
    You may well find you need a chain guide to keep the chain on with that crankset.
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.9Kg
  • N0bodyOfTheGoatN0bodyOfTheGoat Posts: 5,120
    If you fancy a mega-mega-range 11-40 8-speed cassette...

    http://www.ebay.co.uk/itm/Bicycle-Freew ... 2447446057?

    They come as standard on the kids Whyte 403 for 1x8, with an Altus M310 rear mech.
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  • jsisidorejsisidore Posts: 122
    If you fancy a mega-mega-range 11-40 8-speed cassette...

    http://www.ebay.co.uk/itm/Bicycle-Freew ... 2447446057?

    They come as standard on the kids Whyte 403 for 1x8, with an Altus M310 rear mech.

    Neat. Is this a type of cassette you can modify? I have the shimano tourney one, first I need to check what kind of rear hub I have.

    p.s. the new crankset is too close to the frame and the chain is crossed to the point of touching the higher gears, I suppose I need spacers but it looks like I can move the chainring to the outside of the crankset so I will try that first.
  • jsisidorejsisidore Posts: 122
    The Rookie wrote:
    You may well find you need a chain guide to keep the chain on with that crankset.
    I will definitely need one. Which one should I get? I know nothing about them.

    How about this one?
    https://www.evanscycles.com/hoy-pinnacl ... ews-header

    I don't need anything fancy or expensive, definitely not expensive :lol:
  • The RookieThe Rookie Posts: 27,761
    That one would do the job just fine.
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.9Kg
  • jsisidorejsisidore Posts: 122
    It appears I have a freewheel, and it also appears that 8 speed freewheels are rare, expensive and not safe for the axle? I managed to find a sunrace 8 speed 13-32 freewheel (double the price of a cassette) and I don't like the range. Can't believe this is happening but I will have to get a new wheel which raises a myriad of other questions, the width of the rim, the length of the freehub, and will all of it fit between the dropouts, I measured almost 138mm and I read you only need 135mm so I'm good?
  • jsisidorejsisidore Posts: 122
    So far I found these two wheels, price is fair but there's little description. Are these considered road, hybrid or mtb? And what is the difference between the two?

    https://www.tredz.co.uk/.Tru-Build-700c ... _32900.htm
    https://www.tredz.co.uk/.Tru-Build-Rear ... _26783.htm
  • cooldadcooldad Posts: 32,599
    One says freewheel, which you already have, one says freehub, which you want. The pictures appear to lie. One of them anyway.
    They say trekking wheels, so I wouldn't do any really gnarly stuff with them.
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  • jsisidorejsisidore Posts: 122
    Trekking is fine, I think the 240 one is trekking as it has a wider rim but it does say freewheel...
  • cooldadcooldad Posts: 32,599
    Which doesn't help.
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