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Old 07-31-14, 08:51 AM   #1
The Golden Boy 
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Suntour LeTech Rear Derailleur Info

OK- I've done the Googling for the LeTech rear derailleur. Most of the results are me yapping about it.

For those of you playing along with copies of the home game... the Suntour LeTech was Suntour's top of the line touring derailleur around 1984. It was really cool, it was really modern (with the fancy computer font) and even modern-er with Suntour's triple pivot system. Aside from the computer font, it was a really nice looking and superbly engineered piece of machinery meant to handle monsterous amounts of chain slack and a huge rear cog.




By the way- dig the "almost quick cage" design. Just loosen the nut on the lower pulley (don't remove it), and that enclosing cage just slides out of the way. REALLY well thought out.



My LeTech came on my Voyageur SP. When I got my VSP, it was in the middle of winter, I had the LeTech on it, and it worked great on the stand. I didn't post a "NEW BIKE DAY" thread because I wanted to have it all cleaned up and do a photospread of the finished product. I also didn't pay a hell of a lot of attention to how the RD was set up because... it's just an RD- how difficult can it be? I got the bike all Frame Savered, rebuilt and properly put into my idea of what a king **** touring bike should look like- And apparently it's with a circa 1990 Suntour XC Pro RD.

I've been contemplating replacing the Sachs/Huret DuoPar on my Trek 720- Because the 720 is a cool and unique bike, I would like to use a unique and highly functional device- so I went to thinking about using the LeTech. HOWEVER, when I mounted the LeTech, the chain tension on the lower pulley pulled the lower cage down and THAT pulled the intermediate pivot down as well- leaving the upper pulley with no chain tension. Quite simply, I don't know what the hell I'm doing and can't figure out the chain routing.

The clearest picture I've seen of the mounted LeTech doesn't show how the chain routes through the pulley pivots...







Does anyone have a bike running a LeTech rear derailleur that they can snap some pix of?

Thanks!
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Old 07-31-14, 09:21 AM   #2
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It reminds me of the 2nd(?) version of the Mountech, and I have to admit not really scoping one out before since I don't usually ride friction shifters with huge freewheels.
I remember Shimano 600 derailers with push-button chain-release latch on the cage, from the late 1970's.

Cool bike though, with that crankset you can pretty well assume it's a great find. Did you ever post photos of the bike?

Had those cranks on my '84 Stumpjumper Sport, on my Centurion ProTour15, and even now on my Nishiki Seral tourer.

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Old 07-31-14, 10:56 AM   #3
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Hey D,

That second pic there is the best "in use" pic of a LeTech RD that I found on the internets. It's not mine- it's of a Centurion Pro 15. However, it looks like the 84 Pro 15 was pretty much built like the Voyageur SP- LeTech rear, Mountech front and Sugino AT cranks.

Here's my VSP right after I sort of finished with it:





When I first put it together- I put on an XC Pro, switched it out for a Cyclone and then put the XC Pro back on:







Right now I have an M735 Deore XT on my Trek 720- but it doesn't seem to show as elegantly as the XC Pro stuff does. If I don't get this figured out, I'll probably put a pretty XC Pro on there...
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Old 07-31-14, 12:12 PM   #4
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The Cyclone is the sexiest one, and I really enjoy using retrofriction levers with Suntour mech's!
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Old 07-31-14, 01:07 PM   #5
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Quote:
Originally Posted by dddd View Post
The Cyclone is the sexiest one, and I really enjoy using retrofriction levers with Suntour mech's!
Have you ever used the Sachs/Huret ratcheting shifters? IMO, they have that smooth action, but with ratcheting. It was a REALLY tough decision to go with the Simplex shifters on there- in any case, they're French.







IMO the XC Pro goes better on there, and the Cyclone is now on the 78 Trek 730 frame- working with some mid 80s Suntour Sprint shifters:




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Old 07-31-14, 06:36 PM   #6
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I used ratcheting Sprint shifters long ago, as an upgrade to a mid-80's Cannondale, and they worked extremely well.

I'm thinking you must have bought that drillium crankset from a French Ebay seller? They sell lots of them!
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