New Shimano 12-36 Cassette

[thebigschott]

I heard these are to only work with the long cage shadow type rear derailleurs. Can anyone else verify?

[AZTtripper]

I don't see how they could make a cassette that would only work with their derailleurs but when it comes to Shimano I wouldn't put it past them.

I'll ask the LBS guy to email BTI and see what they have to say.

[Rob]

So I got one of these in my hand right now.  It came off a stock Specialized Stumpjumper HT 29er.  The der. being used was a Sram X9 long cage and it shifted fine.

[thebigschott]

Good to know! Thanks for the heads up

[Slim]

Specialized is listing these cassettes as stock spec on several of their 2010 29ers!

Ed: Sorry. just saw the post by Rob 2 lines up with the same info!

[AZTtripper]

I saw two of them on the Tour of the White Mountains pre ride this weekend serious gear envy looks like they are all going to the new bikes but none for the after market yet.

[DaveH]

The specs from BTI:



Not yet available, I'll post up here when they do come available.

A bit of a brick!  I guess that's the price to pay for riding big wheels with little legs 

[Pivvay]

Have you seen a price yet Dave? I was thinking about getting one for Marni.

[DaveC]

WTF is that "extra torque" bit?  Almost as silly as saying your cassette will freak out if it sees a medium cage derailleur.

[DaveH]

Chris - price is the same as any LX cassette.  Fairly cheap  

Dave - Extra torque?  Yea, that's what I thought.  Slightly more torque in that big cog on the freehub body compared to 34 but the margins aren't that tight, and if it's made to handle a big heavy rider you & I have nothing to worry about.

[Slowerthensnot]

In stock at qbp... picking up a few for over the edge...

[donkey]

Just received 16 of these at The Path...they look awesome. I can't wait to try it out. They're heavy...but I guess that's the price you pay!

If anyone wants one send me an email to brian@thepathbikeshop.com They're $48 shipped.

B

[AZTtripper]

I just got mine put it on the wheel last night but haven't ridden it yet.

[AZTtripper]

This thing is great now that I have a few rides in with it on I think it definitely worth the weight.

[thook]

Here is a 48 tooth cog that I made The cheap megarange derailer will work on the cog but won't shift to it the pully bolt hits the cog. Shimano megarange cogset have 24 and 34 for the biggest cogs and it looks like there needs to be 10 teeth or less to shift. Shimano's normal derailers will work on a 12 36 cogset if the 36 is far enough from the dropout such as found on 160 mm rear hub spacing on tandems. If shimano makes the 36 tooth cog it will only be a matter of time until santana tandems has shimano make an 11 36 cogset with 10 gears.  http://share.ovi.com/media/currentresident.bicycle/currentresident.10073

Hello,

I wanted to dig up this older thread in response to this here post. I've just signed up to specifically ask how this was done.

I have a couple of older touring bikes that I'd like to customize the gearing on. Both are half stepped and run to close the same ratio (50/46 and 52/48 respectively). But, to get the range I'd like out of both, I'd like to install some 38 tooth cogs for the low on the freewheels. Well, one is to be freewheel driven and the other by cassette/freehub.

So, if I may ask, how was this done? I can't see myself paying roughly over a $100 for titanium just to do this. Don't have it, eh.

Thanks for any help offered.

[DoctorRad]

There's always these which you can use with an existing cassette:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260545862576#ht_514wt_1165

[thook]

I appreciate the response, DoctorRad.

I've see these, and that is an option I'm not ignoring for my 26" tourer. However, in order to keep within the ratio's I desire to build for the road machines, a 38 tooth cog is what I need:

50/45/24= 14/17/21/26/32/38

52/48/20 = 13/15/17/20/24/28/32/38

It's a perfect match for the half steps. I have discovered I have atleast one 38t chainwheel from a one piece crank that from appearances should work as a cog with necessary mod'ing. In the event it won't work, I'd like to try something else homemade before buying anything. 

[DoctorRad]

For the bike that's going to use a freewheel rather than a cassette, what freewheel body are you using? In the 80s - as I'm sure you may well be aware - SunTour made 5-speed freewheels with 38-tooth cogs. These are not uncommon on eBay and you may be able to adapt one of the largest cogs to suit your purposes.

Edit: Given that the 14-38 freewheels were from SunTour's 'Perfect' range, according to this page from the late, great Sheldon Brown:

http://www.sheldonbrown.com/suntour.html

...you should be able to take the splined 38-tooth cog from one of them and put it onto a 'New Winner' freewheel body. Again, complete New Winner freewheels ready for disassembly are available on eBay and elsewhere on the 'net.

You may also want to take a look here and order their "Comprehensive Official Suntour Freewheel Manual":

http://www.yellowjersey.org/stfw.html

Oh to find a NOS well-stocked SunTour cog board...

[thook]

No kidding. And, trust me.........I've seen those 38t cogs and freewheels on ebay. I have a bunch of Suntour freewheels, but only a couple of Shimano cassettes to play with already. The easiest thing for me to do would be to hold out for a little while until I can afford to buy the cogs or freewheels either used or NOS, but I'm being a little impatient I suppose. I see all the ingenuity Sheldon Brown or others have been able to muster and it gets my creative juices flowing, as well.

I think I shall see what I can do with this one 38t chainwheel first. If I'm not happy with it, I'll sock my pennies and visit ebay on some future date. Part of me just has to see if I can do it. The challenge, eh?

[DoctorRad]

Been doing a little research on this, here's what I've found:

• The 5-speed SunTour 14-38 freewheels are from their 'Perfect' range. The two largest cogs on these blocks are compatible with the 'A' position on SunTour 'Winner' freewheels and their variants. You can pick these up on eBay for around $30.
• The last two cogs on these freewheels are 28 and 38 teeth.
• According to this scan, the largest cog you can get in the third-largest position on a Winner freewheel (New Winner in this case) is 21 teeth.
• These folks have Winner freewheels in 12/13-32/34 variants for fairly reasonable prices. I think the ones they have labelled as "Winner" - rather than "Winner Pro" - are in fact "New Winner" as I don't think you could get 7-speed versions of the original Winner freewheels. The "Ultra" here refers to the cog spacing, i.e. ~5mm rather than ~5.5 for "normal" 5- and 6-speed.

I therefore think you could get hold of a New Winner freewheel, take the cogs off it with a couple of chainwhips and replace the largest two with the 28 and 38 cogs from the Perfect freewheel. This would give you a 7-speed 'UltraRange' freewheel with 12 or 13/14/16/18/21/28/38 cogs. A poster here says "If you get a Winner or New Winner you can move a few of the largest cogs on your perfect freewheel over to your new freewheel".

New Winner freewheel bodies

One caveat from me - there many be numerous others: I'm not sure how well the resulting freewheel will index, even with 7-speed SunTour shifters. As ever, a Shimano rear mech with a floating top jockey will probably help.

Such a freewheel would provide an excellent - if coarse - range of gears for a 1x7 or 2x7 setup.

Best of luck