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Shimano Alpine? gearing (Alternative Low range gearing)(5 posts)

Shimano Alpine? gearing (Alternative Low range gearing)chris zeller
Aug 24, 2001 12:48 PM
I saw a picture of a Shimano cassette on the net that was called something like an Alpine cassette. It was a road cassette with normal gearing ~26-12 with a super large 32 or 34 sprocked termed a "Bail Out" gear. Has anyone seen this? Does Shimano still make it? It's not on the website. Any idea where I could get one? Do you need a long cage derailer for this?

I'm currently running a Ultergra triple on an 11-34 XT cassette with an XTR derailer on my light touring bike that I also use for training/recreational riding. This gives me a pretty good range of gears but maybe this would give me a finer set of gearing options that would be more compatable if I did any group rides.
re: Shimano Alpine? gearing (Alternative Low range gearing)KStone
Aug 26, 2001 4:59 PM
Chris
One way to get both cassette choices is buy the 12-23 9spd and do this to also get a 12-32. You will need and old used 8spd xx-32 cassette for the 25 cog and will be adding it to the 9spd setup while removing one of the loose 9spd cogs.
Remove the 32 cog from an old 8 spd xx-32 cassette. Remove the 9spd cassette from the wheel, put on the 32 cog and one of the loose 9spd spacers.
Replace the 9spd 3 cog spider and check the shift ramp alignment with the 32 cog. The correct alignment will be visually obvious and can be corrected by removing the 32 cog and filing the wide spline narrow to match the rest. The 32 cog can now be indexed on the freewheel for shift ramp alignment (8 different ways). Reassemble the rest of the 9spd cassette leaving out the loose 9spd cog of your choice.

I've done this many times and regularly switch back and forth for hilly terrain, although I use a 27, not a 32. I've never experienced any shifting or chain problems but suggest you try this setup yourself.
You'll still need the long cage for a 32 though.
I think Shimano calls it 'Mega shift' but it's a 7 or8 spd used on hybreds.
KStone
Thanks!Chris Zeller
Aug 28, 2001 6:48 AM
Thanks, I've since heard that this is called megarange. I like your modification better because it retains the top end components.
different approachKStone
Aug 31, 2001 1:28 PM
Chris:
Group riding with a triple
Most modern triples have 30/42/52 chainrings that worked great back when 6 and 7 spds were all we had. Now with 9 and 10 spds the 30/42/52 rings make no sense.

Using 26/39/52 rings with a 12-21 or 12-23 9 spd cassette, the middle and big ring ratios are perfect for group rides. With the 'granny 26' for the steep stuff.

In fact, accidental shifts to the granny can be eliminated by adjusting the frt. der. stop screw to only allow using the 39/52 rings.

Plan to ride the hills solo, back out that screw for access to the granny 26.

KStone
different approachKStone
Aug 31, 2001 1:35 PM
Chris:
Group riding with a triple
Most modern triples have 30/42/52 chainrings that worked great back when 6 and 7 spds were all we had. Now with 9 and 10 spds the 30/42/52 rings make no sense.

Using 26/39/52 rings with a 12-21 or 12-23 9 spd cassette, the middle and big ring ratios are perfect for group rides. With the 'granny 26' for the steep stuff.

In fact, accidental shifts to the granny can be eliminated by adjusting the frt. der. stop screw to only allow using the 39/52 rings.

Plan to ride the hills solo, back out that screw for access to the granny 26.

KStone