My rear hub is for 7 speeds, I put an 8 speed cassette removing the last cog (smallest). I also have an 8 speed derailleur and 8 speed shifter triggers. Changing gears works fine but if I trigger to the last gear the chain will come off (ie I have shifting of the derailleur but a cog is missing). I can use the bike like this if I be careful and not pass the last cog (biggest). Though I prefer to fix it if possible. Is there a way to fix that? I tried everything with no succeed.
Markleo
You might be able to set the H limit screw so that the derailleur doesn't go past the 7th gear. Put the shifter into 8 and tighten the screw which will (eventually) move the derailleur closer to the wheel.
However, if that works it's not really a fix but a bandaid. Do you plan on upgrading your hub to support an 8-speed cassette?
However, if that works it's not really a fix but a bandaid. Do you plan on upgrading your hub to support an 8-speed cassette?
Set the limit screw on the rear derailleur...which would actually be the "L" to prevent shifting past the largest cog.
^^^ his freehub (mentioned in different verbiage) is narrower and will only accept 7 cogs
**MTBr72 ir right about the L-limit screw - but always adjust BOTH for good measure :thumbsup:
**MTBr72 ir right about the L-limit screw - but always adjust BOTH for good measure :thumbsup:
^ highdell is correct IMHO, except that 7 speed cassettes aren't all that hard to find online. Still, some LBSs might not stock them, although many sizes are still available from Shimano, SRAM, etc.
8 speed freewheels were always a really bad idea, unless you liked wheels with lots of dish and replacing broken axles was your idea of fun.
Re 7 versus 8: Just because someone doesn't remember/know something used to exist (or not exist at some point) does not mean that they are right. Please do your research *before* stating things as fact which are not so, or denying reality. Thank you.
8 speed freewheels were always a really bad idea, unless you liked wheels with lots of dish and replacing broken axles was your idea of fun.
Re 7 versus 8: Just because someone doesn't remember/know something used to exist (or not exist at some point) does not mean that they are right. Please do your research *before* stating things as fact which are not so, or denying reality. Thank you.
You can keep the derailleur from going off of either end of the cassette by using the limits screws.
You have two choices on how to set up the shifter/derailleur: Line up 1st gear on the shifter with the big cog in the back, or line up 8th gear on the shifter with the smallest cog on the back (which is what I think you did). I would do the first of these options.
I would set the cable tension so that 1st gear on the shifter lines up with the big cog. This way, you loose the "8th" gear. I think the advantage to this is that if you "overshift" into 8th gear, the cable just goes slack. Use the high limit screw to keep the chain from moving beyond the small cog.
If you line up 8th gear on the shifter with the small cog, then overshifting means that as you press the shifter to downshift past the large cog (from 2nd to 1st on the shifter), the shifter is pulling the cable and fighting the low limit screw, and you could possibly break something if you are feeling hamfisted that day.
7 speed cassettes are pretty cheap, but if you are happy with the gearing you have with the 8, no reason not to keep running it.
You have two choices on how to set up the shifter/derailleur: Line up 1st gear on the shifter with the big cog in the back, or line up 8th gear on the shifter with the smallest cog on the back (which is what I think you did). I would do the first of these options.
I would set the cable tension so that 1st gear on the shifter lines up with the big cog. This way, you loose the "8th" gear. I think the advantage to this is that if you "overshift" into 8th gear, the cable just goes slack. Use the high limit screw to keep the chain from moving beyond the small cog.
If you line up 8th gear on the shifter with the small cog, then overshifting means that as you press the shifter to downshift past the large cog (from 2nd to 1st on the shifter), the shifter is pulling the cable and fighting the low limit screw, and you could possibly break something if you are feeling hamfisted that day.
7 speed cassettes are pretty cheap, but if you are happy with the gearing you have with the 8, no reason not to keep running it.
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