1991 Pine Mountain on "slicks" and closer ratios

daugs

daugs

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I'm putting slicks on one of my MTB projects with a 13-23 7 speed block. Ideally want to use a short cage rear derailleur and have an XT RD-M732 which is marked with max 28 total 28 which I understand is max cog at rear 28 and max capacity of difference in rear cogs (10 in this case) plus difference at front which is currently 24-36-46 ie 22 and hence total is 32 ie too much.

A bit of research says some of the Shimano figs are conservative, has anyone tried this sort of thing. Also I need to replace a couple of jockey wheels, and was wondering does having 10 or 11 toothed jockey wheels make much difference.

QUESTION RESOLVED - PICS FURTHER DOWN
 
Re: Derailleur capacity / gears

get the same tooth cog as it was designed for. otherwise they'll probably not fit particularly well ;-)

Your setup will work fine.
 
Re: Derailleur capacity / gears

thanks for that - good news, currently they are 10 tooth and assume thats right for the mech although most seem 11, if anyone can confirm that would be great, cheers
 
Re: Derailleur capacity / gears

Shimano's figures are for what works guaranteed. Things that throw it out are: short chainstays, thick dropouts, fat seat tubes etc.

I reckon you will just about get away with it. Whatever you do, ensure it will work on the big-big combination (it might be a bit rattly) - small-small might have the chain tension a bit loose.

Worth a try I think.
 
Re: Derailleur capacity / gears

If you do the calculation again without the big sprocket and big chain-ring / small sprocket and small chain-ring combination chances are you will be fine :wink:
 
Re: Derailleur capacity / gears

The best case is that the chain goes slack on small-small, which is fine. Whatever you do, ensure you can engage big-big. If the chain is too short it tends to stuff the rear mech into the spokes, followed by a collapsed wheel and crash. :shock:
 
Re: Derailleur capacity / gears

hamster":18971l7w said:
The best case is that the chain goes slack on small-small, which is fine. Whatever you do, ensure you can engage big-big. If the chain is too short it tends to stuff the rear mech into the spokes, followed by a collapsed wheel and crash. :shock:
Click to expand...
:shock: yes will try to avoid that one

I've always checked the chain length on big-big plus 2 links (without gears) when fitting to get the right number of links rather than big-small with gear at vertical ish but is there a definitive way to check chain length ?
 
Re: Derailleur capacity / gears

Cant find a pic but I ran a Ging chain device with my 32/11t - 39/53t drop bar on-off road work bike.

Edit: could be a 30t but it was an XT/ 600 mixamech!

file.php
 
Re: Derailleur capacity / gears

finally got round to posting on this but all sorted and works ok with 13-23 on rear and 24-36-46 on front with XT mech as per OP, all runs pretty slick changes and no issues even in ratios that wouldn't use

8672995774_a4bb1bbc89_z.jpg


8671892181_5f7f682053_z.jpg
 
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