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Prevent chain dump?
Hi all,
I replaced my three speed front chainwheel with a single - speed. (I never used the two smaller chainwheels and this solved a nasty chainline issue, mostly.) Then I removed the front derailleur (SP!) My modification works great most of the time but I did have one tiny issue. When pedaling uphill, I lost the chain off the front chainwheel once. It dumped outboard, towards the right pedal. Other than re-installing the front derailleur (SP!), is there a chain guiding dohickey that I can install to prevent the chain dump from happening again? Thanks! --Winston |
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#2
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Prevent chain dump?
"Winston" wrote in message
news:XUNok.823$_H1.21@trnddc05... Hi all, I replaced my three speed front chainwheel with a single - speed. (I never used the two smaller chainwheels and this solved a nasty chainline issue, mostly.) Then I removed the front derailleur (SP!) My modification works great most of the time but I did have one tiny issue. When pedaling uphill, I lost the chain off the front chainwheel once. It dumped outboard, towards the right pedal. Other than re-installing the front derailleur (SP!), is there a chain guiding dohickey that I can install to prevent the chain dump from happening again? Thanks! --Winston Yep, a chain guide for downhill bikes. They have a single ring up front, no front derailluer and a chain tensioner/guide. I have one on my DH bike and the hardtail I'm building up atm. I run a 9 speed 11-32 cassette and have plenty of range for what I do... MRP, Blackspire, E-13 are a few brands that can get you started... Cheers Dre |
#3
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Prevent chain dump?
Dre wrote:
(...) Yep, a chain guide for downhill bikes. They have a single ring up front, no front derailluer and a chain tensioner/guide. I have one on my DH bike and the hardtail I'm building up atm. I run a 9 speed 11-32 cassette and have plenty of range for what I do... MRP, Blackspire, E-13 are a few brands that can get you started... Cheers Dre Thank you Dre! --Winston |
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Prevent chain dump?
On Aug 13, 9:47*pm, Winston wrote:
Hi all, I replaced my three speed front chainwheel with a single - speed. (I never used the two smaller chainwheels and this solved a nasty * chainline issue, mostly.) Then I removed the front derailleur (SP!) My modification works great most of the time but I did have one tiny issue. When pedaling uphill, I lost the chain off the front chainwheel once. It dumped outboard, towards the right pedal. Other than re-installing the front derailleur (SP!), is there a chain guiding dohickey that I can install to prevent the chain dump from happening again? Thanks! --Winston Chainguards are available. Essentially 2 chainrings w/o teeth on either side of your single ring Or a single guard outboard and a chainwatcher inboard. |
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Prevent chain dump?
Winston wrote:
I replaced my three speed front chainwheel with a single - speed. Did you reuse the existing chainwheel on the new crank, or was it all new? Singlespeed chainwheels have different tooth profiles than multispeed ones and are less likely to allow the chain to fall off. -- Work and recreation are not often effected at the same time. One using a bicycle in business makes an exception to the rule. - Dr. Edgar H. Earl, Rochester. (~1892) |
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Prevent chain dump?
Rex Kerr wrote:
Winston wrote: I replaced my three speed front chainwheel with a single - speed. Did you reuse the existing chainwheel on the new crank, or was it all new? Singlespeed chainwheels have different tooth profiles than multispeed ones and are less likely to allow the chain to fall off. I replaced the BB, cranks and chainwheel. Reused the pedals, chain and everything else. As you say, I trusted that the non-shifting tooth profile of the single speed chainwheel would make 'chain fall off' less likely. Since my changes the bike is much more reliable. Still looking for a straighter chainline, though. I have since installed a bashguard but I'm now looking to purchase a Mr. Dirt Gizmo DH that Dre mentioned. Thanks! --Winston |
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Prevent chain dump?
Qui si parla Campagnolo wrote:
On Aug 13, 9:47 pm, Winston wrote: (...) Chainguards are available. Essentially 2 chainrings w/o teeth on either side of your single ring Or a single guard outboard and a chainwatcher inboard. Thanks! I'm now looking for a source to purchase a Mr. Dirt Gizmo Chainguide. --Winston |
#8
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Prevent chain dump?
In article XUNok.823$_H1.21@trnddc05,
Winston wrote: Hi all, I replaced my three speed front chainwheel with a single - speed. (I never used the two smaller chainwheels and this solved a nasty chainline issue, mostly.) Then I removed the front derailleur (SP!) My modification works great most of the time but I did have one tiny issue. When pedaling uphill, I lost the chain off the front chainwheel once. It dumped outboard, towards the right pedal. Other than re-installing the front derailleur (SP!), is there a chain guiding dohickey that I can install to prevent the chain dump from happening again? Lightest (!!!) solution is the old derailleur, sans cable, sans shifter. Set the stops to lock its positions and Bob's your uncle. -- Michael Press |
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Prevent chain dump?
Michael Press wrote:
In article XUNok.823$_H1.21@trnddc05, Winston wrote: Hi all, I replaced my three speed front chainwheel with a single - speed. (...) Lightest (!!!) solution is the old derailleur, sans cable, sans shifter. Set the stops to lock its positions and Bob's your uncle. Thanks Michael, I shall try that first. --Winston |
#10
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Prevent chain dump?
On Aug 15, 9:39*am, Winston wrote:
Michael Press wrote: In article XUNok.823$_H1.21@trnddc05, *Winston wrote: Hi all, I replaced my three speed front chainwheel with a single - speed. (...) Lightest (!!!) solution is the old derailleur, sans cable, sans shifter. Set the stops to lock its positions and Bob's your uncle. Thanks Michael, I shall try that first. --Winston Hi there,I always use the derailleur as a chain guide on both of my mtbs,my hybrid and my roadie,as Michael says just do the adjustment screws,for my road bike I have cut off any unwanted bits i.e the arm that the cable bolts to and the bottom of the cage as you only need between the top and middle of the cage with my roadie BUT I did this mostly for better looks,once adjusted I also lowered the deraileur so that the top of the deraileur cage has about 3mm gap between chain and the cage this will garentee that the chain wont jam and bend the cage as aposed to the original high which is above the chain ring,I dont have any issues with chain ring guards/guides I just cant justify spending over $100(NZ dollars)for even the basic ones when I can do it for nothing,I do spend a bit of time to make sure my chain line is where I want it though. |
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