Sbloomer Posted June 9, 2019 Posted June 9, 2019 Hi all Both my kids really battle with the gripshifts on both their 24" bikes. So I decided to give the trigger shifters a go on my son's bike first. Now its a 3x7, and swapping the rears was fine and shifts brilliantly (and he loves it) Its the front that I am having a lot of difficulty with, which makes me think that the derailleur and triggers are mismatched in terms of pull ratio. It requires a considerable amount of strength in the thumb to shift from small to middle chainring (and he cant do it without stopping), but also if you swing from 1 to 2, it actually tries to shift onto the big chainring. But shifting from middle chainring to big chainring is impossible. You almost need two hand to get it across. I've never had a problem adjusting the front with the gripshifts, but I cannot get the triggers to work properly on the front. The derailleur is a bottom pull Shimano. but I would have thought that it would work properly as is.
ChrisF Posted June 9, 2019 Posted June 9, 2019 Something wrong with the setup ... Maritz use the exact same shifters. Shifting without undue hassles. That said, it took a while for his hands to get big enough to operate the front shifter. The "up-stroke" is too long for their small hands ....
Grease_Monkey Posted June 9, 2019 Posted June 9, 2019 1x Rather?With small kiddies and small wheels 1x is not always ideal.
Sbloomer Posted June 9, 2019 Author Posted June 9, 2019 Something wrong with the setup ... Maritz use the exact same shifters. Shifting without undue hassles. That said, it took a while for his hands to get big enough to operate the front shifter. The "up-stroke" is too long for their small hands ....Chris. I as an adult can’t do it. Easily.
ChrisF Posted June 9, 2019 Posted June 9, 2019 Chris. I as an adult can’t do it. Easily. Certainly something wrong then. If you remove the cable, can you freely move the front derailure ? If you "pull" on the cable, can you move the shifters smoothly ? Does the cable move freely in the housing? Really hope you get it sorted.
sampras Posted June 9, 2019 Posted June 9, 2019 cable routing is not right loosen and tighten over top from angle you sent and maybe adjustment
PeterF Posted June 10, 2019 Posted June 10, 2019 "which makes me think that the derailleur and triggers are mismatched in terms of pull ratio". Front derailleurs don't have pull ratio's like rear derailleurs, they just do what the shifter tells them to. This is why it is possible to use a SRAM front derailleur with a Shimano front shifter and visa versa.
Sbloomer Posted June 10, 2019 Author Posted June 10, 2019 "which makes me think that the derailleur and triggers are mismatched in terms of pull ratio". Front derailleurs don't have pull ratio's like rear derailleurs, they just do what the shifter tells them to. This is why it is possible to use a SRAM front derailleur with a Shimano front shifter and visa versa. Then why can it, when switching from small to middle chain ring can it go all the way to the big. It was perfectly adjusted with the grip shift. If it was a matter of just switching out the front shifter then there should have only been very minor adjustments necessary.
PeterF Posted June 10, 2019 Posted June 10, 2019 I suspect that the cable is not routed correctly. Gripshift is pretty forgiving as you can pretty much just stop twisting when you are in the correct gear.
PeterF Posted June 10, 2019 Posted June 10, 2019 Have a look at this link for an idea on how the cable is supposed to be routed. https://si.shimano.com/pdfs/si/SI-6NGFA-004-ENG.pdf
greg_sa Posted June 10, 2019 Posted June 10, 2019 Strange, when I recently bought my 6 year old son a new bike with grip shift, I was expecting to need to swop it out immediately for a trigger shifter... But my son has no issues at all with the grip shift.
Sbloomer Posted June 10, 2019 Author Posted June 10, 2019 Have a look at this link for an idea on how the cable is supposed to be routed. https://si.shimano.com/pdfs/si/SI-6NGFA-004-ENG.pdfI can’t find anywhere (yet) which shows how this should be routed. Maybe I’m just dumb
Shebeen Posted June 10, 2019 Posted June 10, 2019 Maybe I'm on the wrong track here, but you shouldn't have to adjust the FD at all. All the shifter does is pull a cable. Can you still pull that cable manually and the FD moves all the way?
Sbloomer Posted June 10, 2019 Author Posted June 10, 2019 Maybe I'm on the wrong track here, but you shouldn't have to adjust the FD at all. All the shifter does is pull a cable. Can you still pull that cable manually and the FD moves all the way?Yes. Pulling it manually works fine.
ChrisF Posted June 11, 2019 Posted June 11, 2019 Wonder if you got a dud shifter ? Or possibly the cable is pinched somewhere ? We certainly dont have these issues with our set (touch wood)
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