Advertise on Bikeforums.net



User Tag List

Results 1 to 18 of 18
  1. #1
    Senior Member Shahmatt's Avatar
    Join Date
    Mar 2013
    Location
    Singapore
    My Bikes
    Oyama East Village
    Posts
    248
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    60T bash guard to go with a 56T Doval chain ring?

    I'm considering upgrading to a 56T chain ring on my bike, and going with the Doval (elliptical) chainring. I'm not sure how effective these are but I need the large size anyway and am willing to give it a try. Link below:

    http://list.qoo10.sg/item/DOVAL-ROAD...-56T/407636230

    The Doval seller does not sell bash guards to go with it.

    After hunting around I've come across a 60T circular bashguard. I'm guessing the 56T may not cover all of the chain ring due to the elliptical shape. Link below:

    http://www.ebay.com/itm/Driveline-Ba...item3ccf3b7487

    As long as the BCDs match, should there be anything else I need to worry about?

  2. #2
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    39,762
    Mentioned
    25 Post(s)
    Tagged
    0 Thread(s)
    IDK you linked to an italian seller .. and they are, in that link not going to ship it ,
    being on holiday.. for a while..

    & I dont think it will take much of a Bashing ..
    Last edited by fietsbob; 01-27-14 at 09:45 PM.

  3. #3
    Senior Member Shahmatt's Avatar
    Join Date
    Mar 2013
    Location
    Singapore
    My Bikes
    Oyama East Village
    Posts
    248
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fietsbob View Post
    IDK you linked to an italian seller .. and they are, in that link not going to ship it ,
    being on holiday.. for a while..

    & I dont think it will take much of a Bashing ..
    Yes I did notice that the seller was not available.

    I am more concerned about the principle of the thing. Could a circular bashguard do the job?

    My main purpose is to keep my trousers clean when commuting to the office. Alternative methods are also welcome.

  4. #4
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,795
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Shahmatt View Post
    Yes I did notice that the seller was not available.

    I am more concerned about the principle of the thing. Could a circular bashguard do the job?

    My main purpose is to keep my trousers clean when commuting to the office. Alternative methods are also welcome.
    As long as the bash guard is consistently bigger than the e ring, it should work as expected.
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

  5. #5
    Senior Member Mauriceloridans's Avatar
    Join Date
    Mar 2007
    Location
    Shreveport
    My Bikes
    1983 Trek 520, early 80's Univega Gran Tourismo, '98 Santana Arriva
    Posts
    269
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Get some elastic chord or ribbon from a fabric store and cut and sew it so it fits on your ankle over your sock without stretching. When you get ready to mount your bike just fold your pant leg and pull the elastic over the pants cuff. Just consider it something to wear every day over the sock to be deployed as needed.

  6. #6
    Senior Member Shahmatt's Avatar
    Join Date
    Mar 2013
    Location
    Singapore
    My Bikes
    Oyama East Village
    Posts
    248
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by cplager View Post
    As long as the bash guard is consistently bigger than the e ring, it should work as expected.
    Thanks Charles. That was the idea. I'll have to make sure of that before buying.

  7. #7
    Senior Member Shahmatt's Avatar
    Join Date
    Mar 2013
    Location
    Singapore
    My Bikes
    Oyama East Village
    Posts
    248
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Mauriceloridans View Post
    Get some elastic chord or ribbon from a fabric store and cut and sew it so it fits on your ankle over your sock without stretching. When you get ready to mount your bike just fold your pant leg and pull the elastic over the pants cuff. Just consider it something to wear every day over the sock to be deployed as needed.
    Something like a trouser clip then?

  8. #8
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    39,762
    Mentioned
    25 Post(s)
    Tagged
    0 Thread(s)
    I have a circular guard on my Bike friday , [its 'just' a 53t chainring] ..

    I agree .. direct solution, trouser band (make it reflective) at the cuff, to keep it out of the chain..

    (and I wear Black Pants , to make any contact with the chain shmuzz invisible)

    Tucking my trouser cuff into My sox is a free solution ..


    BTW, since its not round no clue as to the Major radius .. ask Seller ..
    Last edited by fietsbob; 01-28-14 at 09:42 AM.

  9. #9
    Senior Member
    Join Date
    Nov 2006
    Location
    Hammonton, NJ
    My Bikes
    Dawes Lightning sport, Trek 1220, Trek 7100
    Posts
    870
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    actually, I wear 2, one for each leg... I don't like the feel of my trouser getting pushed into the crank as I ride...

  10. #10
    Senior Member Mauriceloridans's Avatar
    Join Date
    Mar 2007
    Location
    Shreveport
    My Bikes
    1983 Trek 520, early 80's Univega Gran Tourismo, '98 Santana Arriva
    Posts
    269
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Shahmatt View Post
    Something like a trouser clip then?
    Better, you don't have to keep up with and fuss with another piece of gear. If have on long pants, it's there on my ankle waiting. And I don't need bash guards on all my bikes.

  11. #11
    Senior Member
    Join Date
    Jun 2012
    Location
    SF Bay Area
    My Bikes
    2012 Specialized Sirrus
    Posts
    1,090
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    56T chainring?! The mind boggles
    http://treadrightly.blogspot.com/

  12. #12
    Senior Member blakcloud's Avatar
    Join Date
    Aug 2007
    Location
    Toronto, Ontario
    My Bikes
    Rivendell Sam Hillborne, Brompton S3L
    Posts
    455
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by treadtread View Post
    56T chainring?! The mind boggles
    Small wheel bikes like the one the OP has can certainly use a large chainring. (Oyama folder) Not the same as putting it on a 700 series wheeled bike.

  13. #13
    Senior Member
    Join Date
    Jun 2012
    Location
    SF Bay Area
    My Bikes
    2012 Specialized Sirrus
    Posts
    1,090
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Ah, that makes sense. I didn't see the type of bike in the thread, didn't realize it was a folder with small wheels.
    http://treadrightly.blogspot.com/

  14. #14
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    39,762
    Mentioned
    25 Post(s)
    Tagged
    0 Thread(s)
    actually, I wear 2, one for each leg... I don't like the feel of my trouser getting pushed into the crank as I ride...


    oh well.. Singapore is pretty tropical wear shorts.

  15. #15
    Senior Member Shahmatt's Avatar
    Join Date
    Mar 2013
    Location
    Singapore
    My Bikes
    Oyama East Village
    Posts
    248
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by blakcloud View Post
    Small wheel bikes like the one the OP has can certainly use a large chainring. (Oyama folder) Not the same as putting it on a 700 series wheeled bike.
    Quote Originally Posted by treadtread View Post
    Ah, that makes sense. I didn't see the type of bike in the thread, didn't realize it was a folder with small wheels.
    This is correct. The intention was to use it on a small wheel (16") bike. Not the Oyama but another project I'm working on. The increase in chain wheel size should improve my gear inch range from 30.5 to 74.5 to 35.5 to 87.0. About 16%.

    The city I live in has only a smattering of hills, and I'm used to dealing with them on a low end of around 40 gear inches.

    Quote Originally Posted by Mauriceloridans View Post
    Better, you don't have to keep up with and fuss with another piece of gear. If have on long pants, it's there on my ankle waiting. And I don't need bash guards on all my bikes.
    Thanks. I shall consider this idea. I may go with the chain guard and trouser clips together.

  16. #16
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    39,762
    Mentioned
    25 Post(s)
    Tagged
    0 Thread(s)
    a 38t chainring on a 1.6x 2 speed crank =60.8't' so you can have a big gear and a small one in one.

    Patterson Metro might accept a bigger chainring ..Read them as a 28t[44.8] stock

    Sclumpf speed drive certainly will ..

    of course the planetary overdrive requires a round chainring
    .. as it turns at a different rate than the crank-arm.
    Last edited by fietsbob; 01-29-14 at 09:55 AM.

  17. #17
    Senior Member Shahmatt's Avatar
    Join Date
    Mar 2013
    Location
    Singapore
    My Bikes
    Oyama East Village
    Posts
    248
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fietsbob View Post
    a 38t chainring on a 1.6x 2 speed crank =60.8't' so you can have a big gear and a small one in one.

    Patterson Metro might accept a bigger chainring ..Read them as a 28t[44.8] stock

    Sclumpf speed drive certainly will ..

    of course the planetary overdrive requires a round chainring
    .. as it turns at a different rate than the crank-arm.
    I didn't know that the chain ring was changeable on the Metro actually. Must investigate.

    The Shlumpf drive is interesting but it's outside of my budget.

    Also I am a little concerned about the weight of the overall drive train and hence the steering mechanism. My project is a FWD recumbent so the drive train is moved when turning. The Shlumpf will weigh at least 800g or thereabouts extra, and this weight would be at the extreme end where the moment arm is longest.

    Since the bike is expected to be a city commuter some nimbleness is good. So a simple single chainring for now may be the way to go.

  18. #18
    The Recumbent Quant cplager's Avatar
    Join Date
    Jan 2012
    Location
    Norwalk, CT
    My Bikes
    2012 Cruzbike Sofrider, 2013 Cruzigami Mantis
    Posts
    2,795
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Shahmatt View Post
    Also I am a little concerned about the weight of the overall drive train and hence the steering mechanism. My project is a FWD recumbent so the drive train is moved when turning. The Shlumpf will weigh at least 800g or thereabouts extra, and this weight would be at the extreme end where the moment arm is longest.
    Hey! I thought that username sounded familiar!

    I believe that Christian Blessing has a Shlumpf on his Cruzbike conversion and he's very happy with it. The weight up front will be very noticeable when you are pushing the bike, but not so much when riding it since your legs will deal with the weight.


    That being said, I personally wouldn't do it because (1) the cost and (2 - if your so inclined) you can't use an elliptical rings with them.

    Here's Christian's bike:
    http://Charles.Plager.net
    http://RecumbentQuant.blogspot.com

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •