|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
DIY Derailer Alignment
My wife likes to fall over on her bike, while standing still, to the right,
landing on the rear derailer. While I do replace the hanger whenever it gets bent, I'd still like to check the derailer alignment wrt the rear wheel and/or frame. The Park DAG-1 is 50 beans, so I'm wondering if anyone has had any luck with building their own? I figure all I need is the appropriate sized bolt and some nuts for the derailer hanger end, attached to a hefty piece of straight wood. Then I can just use a ruler to measure from the rim to the wood. Sound reasonable? Thx, Kyle |
Ads |
#2
|
|||
|
|||
DIY Derailer Alignment
Kyle.B.H wrote:
My wife likes to fall over on her bike, while standing still, to the right, landing on the rear derailer. While I do replace the hanger whenever it gets bent, I'd still like to check the derailer alignment wrt the rear wheel and/or frame. The Park DAG-1 is 50 beans, so I'm wondering if anyone has had any luck with building their own? I figure all I need is the appropriate sized bolt and some nuts for the derailer hanger end, attached to a hefty piece of straight wood. Then I can just use a ruler to measure from the rim to the wood. Sound reasonable? Thx, Kyle You don't need a tool: reverse the rearwheel (cogs left) and fit the frontwheel to the dropout (remove the skewersprings, and you might need a 12mm nut as a thick washer to clear the other skewer) It's now easy to see if the wheels are parallel -- --- Marten Gerritsen INFOapestaartjeM-GINEERINGpuntNL www.m-gineering.nl |
#3
|
|||
|
|||
DIY Derailer Alignment
You don't need a tool: reverse the rearwheel (cogs left) and fit the
frontwheel to the dropout (remove the skewersprings, and you might need a 12mm nut as a thick washer to clear the other skewer) It's now easy to see if the wheels are parallel How would that help? I think the poster is wondering about his wife's derailleur hanger alignment, not the wheel alignment. The DAG is an oft-used tool in my experience. I've never had to replace a hanger as a result. -- Phil, Squid-in-Training |
#4
|
|||
|
|||
DIY Derailer Alignment
Kyle.B.H wrote:
My wife likes to fall over on her bike, while standing still, to the right, landing on the rear derailer. While I do replace the hanger whenever it gets bent, I'd still like to check the derailer alignment wrt the rear wheel and/or frame. The Park DAG-1 is 50 beans, so I'm wondering if anyone has had any luck with building their own? I figure all I need is the appropriate sized bolt and some nuts for the derailer hanger end, attached to a hefty piece of straight wood. Then I can just use a ruler to measure from the rim to the wood. Sound reasonable? Thx, Kyle I've done this before. I used a long bolt screwed into the hanger threads and locked it in with a nut. Then I placed a small carpenters square along the bolt and a ruler placed at right angles to measure from the square to various points around the wheel. The long bolt can then be pulled to bend the derailleur hanger until all points measured are equal. |
#5
|
|||
|
|||
DIY Derailer Alignment
deray alignment is tricky(artful as in F1 design by garage floor
chalkmarks) without the gauge. AMuzi tells me the gauge is one step of a sequence of adjustments leading to the exactness apparently required of index shifting-like something found in a modern repair shop for computer cars. the chalkmark method requires eyesight plus mental equations of distance and geometry: as in when the cog and CR faces disappear together then those pieces line up-then eyesight need to follow that postion to the other parts to see what their doing from the intial cog=cr position. try a sting. a string from the down tube then lead alongside the seat tube and carried back to the dropouts then sighted gives an indication of what happened to the dropouts when garanny ran over the frame and may give some visual acuity or orientation for the following. one give away is the chain links enetering and leaving the bottom pulley wheel on the way to(sight)the CR. Which way does the chain bend as it leaves the pulley to the desired cr.Pick the cog=CR combo that annoys.the chain shud be straight. try not to bend the hanger the wrong way. think about the motor movements a few times then look between your legs while upside down thewn go with the tool and bend. That's an adjustment now done with a LARGE channellocks with a LONG handle or a LARGE vise grip, bending the hanger to straighten the chain as seen at the pulley. grab the deray/hanger bolt inboard and outboard sides. |
#6
|
|||
|
|||
DIY Derailer Alignment
|
#7
|
|||
|
|||
DIY Derailer Alignment
On Mon, 09 Aug 2004 18:29:35 -0400, John Forrest Tomlinson
wrote: On 9 Aug 2004 10:10:27 -0700, (g.daniels) wrote: deray alignment is tricky(artful as in F1 design by garage floor chalkmarks) without the gauge. AMuzi tells me the gauge is one step of a sequence of adjustments leading to the exactness apparently required of index shifting-like something found in a modern repair shop for computer cars. I've got the tool at home but a couple months ago while travelling fixed a friends bike with a 12" adjustable wrench and a lot of care and luck. JT That is how I fixed my bent deraileur after a crash. Big ol " crescent wrench and tweeked it back . Works flawlessly. |
#8
|
|||
|
|||
DIY Derailer Alignment
right! when eyeball lining the cr/gearcluster cog so the surfaces
disappear, the pulley cage's sides will then flatten out inperspective and also isappear!and at that point(hehehe), the cage shud be directly under the selected gear cluster gog and perfectly vertically aligned with that cog. it's like learning to read print instead of clouds,tea leaves... |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Shimano rear derailer compatibility | Hal | Techniques | 6 | June 23rd 04 02:03 AM |
new cassette or derailer for better shifting? also brake/shifter combo | tsp | Techniques | 9 | September 23rd 03 02:32 AM |