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Introducing myself (again? Lets see if this one works :)

Old 09-08-22, 03:20 PM
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Ric Toronto 
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Introducing myself (again? Lets see if this one works :)

Bought this great bike around 1991 (the year it was built according to serial nos) It was full Dura Ace 7400 I believe, sis 8.
Wanted shifters on the bars so moved to Ultegra 6700 =10 spd in 2007.
I'm considering riding an event down PCH from San Francisco to LA next year, but as I am older and not as strong, considering changing gearing. I'd love to put a triple chainring on but not sure it can be accomodated. Failing that, I'd like advice on chainring / cassette mods that will help. Current setup is Ultegra 53/39 with cassette 11/28. Probably need a long cage derailleur with changes, (if available)
But I have seen triple Dura ace or Ultegra setups available online and question if I might go that route.
Thoughts and advice is welcomed.
I have tried to post this in an area that I thought was correct...but it ws refused. so ehre I go again as an intro

Last edited by Ric Toronto; 09-08-22 at 03:24 PM. Reason: because this is asking for help ...wrong place apparently
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Old 09-08-22, 03:24 PM
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cxwrench
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Sure, find a triple drivetrain and put it on. You will still be limited to a 27/28t large cog. The long cage triple rear derailleur will NOT work with a larger cog compared to the short cage, the ONLY thing it does is wrap more chain. You can replace the entire drivetrain w/ a compact double and maybe an 11-34 cassette, that will help.
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Old 09-08-22, 03:51 PM
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If your bike will handle a triple then you can put a 3x crank on it, but then you will have to replace the front DR and STI. So that'll get expensive quick.

If you just need a slightly easier gear to pedal in, then take a look at a 50/34 crank.

You current 39F and 28R give you about 35.56 gear inches or a ratio of 1.39. A 32R cog with the 39F will give you 32.09 gear inches and ratio of 1.22.

So with a 50/34 crank, you'll get about the same when in the 34F and 28R, about 31.82 gear inches and ratio of 1.21. So actually better changing the cassette.

And changing the cassette to a larger tooth cog might likely require a change of DR's. Although rear DR's tend to be not too expensive. Changing to a triple might also require a rear DR change, but that'd really require us know exactly what model and version that rear DR is.
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Old 09-08-22, 05:07 PM
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That road gearing is way high for touring. The 39t would make a good big ring; 39/11x27.5" is a 97" gear. Current Kona Dew, for example, comes with 22-36 on the front. So I'd suggest figuring out what the highest gear you actually ever use is, and considering a much smaller double.
Recommended reading: Lowest top gear inch you can happily live with? https://bikepacking.com/plan/granny-gear-inches/
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Old 09-10-22, 09:18 AM
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Ric Toronto 
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Originally Posted by cxwrench View Post
Sure, find a triple drivetrain and put it on. You will still be limited to a 27/28t large cog. The long cage triple rear derailleur will NOT work with a larger cog compared to the short cage, the ONLY thing it does is wrap more chain. You can replace the entire drivetrain w/ a compact double and maybe an 11-34 cassette, that will help.
Thanks. My greater question is about the ability of the Vitus frame to accomodate. In past there were some who thought the Ultegra 10 spd would not fit, though it did and has been good. I have more research to do before buying parts
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Old 09-10-22, 10:43 AM
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If you want to change out everything, then look at Tiagra 10 speed in a 3x front. Then you'll get a pretty low gear with a decent range to the high gears. Or even Sora 9 speed in a 3x if you don't wish to spend the money required for Tiagra.

However you really need to figure out and consider what low gear you have to have. If we didn't have to guess about what exact model of bike you had and what is actually on it right now, there still might be a good inexpensive 2x solution. But still, you have to know what the absolute lowest gear ratio is that you need or want.
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Old 09-10-22, 11:38 AM
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Since you already have a 10 speed setup, you have a few choices. But be honest about where your abilities.

Old school goes the triple route, probably Tiagra 4700 shifters and a GRX RD. For me the most desirable is setting it up as a double with the inner ring only when needed. A 28-38-48 with an 11-36 will probably cover everything. There would be a slight capacity issue since I think the GRX has wrap of around 40t.

The other route is going to a 1x or 2x with a compact or subcompact like a 46-30 and run an 11-36 or 40/42. With an 11-36 your wrap is fine.

The big difference is whether you can ride in the 46t most of the time. Since you won’t have your 39t (or 38t). Since you’ve ridden your 39t you know how much you use it.

I know someone that tours with a 1x 40t and an 11-50. That is also an option, but probably 11 speed.

John

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Old 09-10-22, 11:53 AM
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Originally Posted by Ric Toronto View Post
Thanks. My greater question is about the ability of the Vitus frame to accomodate. In past there were some who thought the Ultegra 10 spd would not fit, though it did and has been good. I have more research to do before buying parts
The older Vitus frame should have no problem working with Shimano or Shimano-compatible BSA-threaded outboard bearings. A Tiagra 4600 triple crankset will work with your 6700 STIs if they are for triple. But if you have the short-cage rear derailleur, it will not take up enough chain.

Whatever you do about the crank, you can use any Shimano 9-speed MTB rear derailleur for extra chain take-up with a 10-speed chain and 6700 STI levers. The least expensive, least invasive way to go would be the MTB RD with a wide-range 10-speed cassette (11-32 or 11-34) and compact double (50-34) crankset. If you really want the triple, then a full Tiagra 4600 would be the most direct way to get there.
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Old 09-25-22, 04:44 PM
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Ric Toronto 
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Originally Posted by Iride01 View Post
If you want to change out everything, then look at Tiagra 10 speed in a 3x front. Then you'll get a pretty low gear with a decent range to the high gears. Or even Sora 9 speed in a 3x if you don't wish to spend the money required for Tiagra.

However you really need to figure out and consider what low gear you have to have. If we didn't have to guess about what exact model of bike you had and what is actually on it right now, there still might be a good inexpensive 2x solution. But still, you have to know what the absolute lowest gear ratio is that you need or want.
Thanks.
1991 when purchased new:
Vitus 979 Dural, w/ full Dura Ace 7402 SIS8
In 2007 it was refitted with Ultegra 6600- 10 Shift / brake levers and RD, C53/39 and 11/28 RD
I've mostly ridden here in Toronto where it's relatively flat. Next June I will be doing SanFrancisco to LA with a group I met at Eroica Cambria earlier this year.
So... having slowed down a bit, I'm looking to figgure how to get this old body up those "hills" in SanFran and beyond.
Thanks for any and all recommendations and suggestions.
Ric
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