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-   -   Triple to Double. (https://www.bikeforums.net/road-cycling/275883-triple-double.html)

Chris9 03-08-07 06:07 PM

Triple to Double.
 
Well for a short story, I started cycling in fall of last year, purchased my own bike about a month ago, and am going to start racing in the B's with the college team. It's been a sharp learning curve, but I'm enjoying the hell out of it. But i guess i should get down to the main question.

I have a triple, 50/39/30 and 12-27 rear 10sp (pretty standard i believe. Will it every be worth my time and money to switch to a double? This would include crank, chain, fd and brifter correct? Is there a way to get away with just buying the crank and chain? It seems feasible that you could max the limit screws to keep it from wanting to shift into a lower gear or something like that. I never use the little ring and I max out every once in a while on the 50.
Thanks

msheron 03-08-07 06:09 PM

Depends on what you may want to accomplish...........weight savings or replace a old work crank.

Chris9 03-08-07 06:16 PM

crank is brand new, everything is 105 10 speed, i got the bike new for such a good price that i didn't mind it being a triple. So I guess more or less weight savings, and then eventually to get the bigger gear.

barba 03-08-07 06:21 PM

You can probably just get away with a crank and a new chain. Waste of time, IMO. The weight savings will be negligible. If you want higher gearing I would get a cassette with an 11 tooth cog. 11-23.

jeffremer 03-08-07 06:27 PM

You won't need new shifters - 105s work with doubles or triples.
You won't need a new chain, unless you feel like replacing it anyway.
You might get by with the same FD, but they're pretty cheap.
You will need a new bottom bracket, unless the new crankset you plan on buying comes with one.

I'd say go for it if you want a reason to spend some money and have fun tinkering with your bike, but otherwise stick with what you got - you shouldn't catch too much grief from your teammates for riding a triple.

Congratulations on riding with the team, what school is it? I'm planning on trying to ride with the UC Berkeley team once I transfer next semester.

Chris9 03-08-07 06:36 PM

I'll be riding for Kansas State, training and being an engineering student doesn't mix well though.

barba 03-08-07 06:41 PM


Originally Posted by jeffremer
You won't need new shifters - 105s work with doubles or triples.
You won't need a new chain, unless you feel like replacing it anyway.
You might get by with the same FD, but they're pretty cheap.
You will need a new bottom bracket, unless the new crankset you plan on buying comes with one.

I'd say go for it if you want a reason to spend some money and have fun tinkering with your bike, but otherwise stick with what you got - you shouldn't catch too much grief from your teammates for riding a triple.

Congratulations on riding with the team, what school is it? I'm planning on trying to ride with the UC Berkeley team once I transfer next semester.

Does he need a new bracket, as it is a 10 speed Shimano crank? Do the 10 speed external bearings differ between doubles and triples?

jeffremer 03-08-07 06:45 PM


Originally Posted by barba
Does he need a new bracket, as it is a 10 speed Shimano crank? Do the 10 speed external bearings differ between doubles and triples?

Nope, you're right, I got it wrong - it's the same BB.

Chris9 03-08-07 06:54 PM

So pretty much all i would need is a new crank? Is there a way to just remove the small ring as a poor man's version?

Mariner Fan 03-08-07 06:56 PM

How long are the crank arms?

barba 03-08-07 06:57 PM


Originally Posted by Chris9
So pretty much all i would need is a new crank? Is there a way to just remove the small ring as a poor man's version?

You can if you set the limit screws correctly, but I see little point. The weight savings are small and a standard double crank's small ring is 39t. Your's would be a 42.

Chris9 03-08-07 06:58 PM

175

Chris9 03-08-07 07:00 PM

Barba- Yeah true so if i possibly sell the triple (it has only 60 miles on it now) and buy a double (preferably black). I figure I wouldn't lost a lot from the whole deal. Does this sound correct? Thanks

barba 03-08-07 07:08 PM


Originally Posted by Chris9
Barba- Yeah true so if i possibly sell the triple (it has only 60 miles on it now) and buy a double (preferably black). I figure I wouldn't lost a lot from the whole deal. Does this sound correct? Thanks

You may be able to do that. If you find someone wanting to go from double to triple, you may be able to arrange a whole sale drive train swap.

probikekit.com sells the 105 double crank for $130 or $155 to jump up to Ultegra (shipping included). If you can get a reasonable amount out of your triple, it may be worth it to you. I guess it depends on how broke a student you are.

Chris9 03-08-07 07:11 PM

Is there much difference from 175 cranks to 172.5 in feeling? I guess you would get a little less torque, but be able to lean a little more without hitting it on the ground.

recneps 03-08-07 07:13 PM

you should be able to do it easily, im pretty sure you could just take the inner ring( i havnt messed with the new shimano cranksets) off the crankset you might need some shorter chainring bolts. and any competent mechanic can lock out the fd.

only reason you would want to do this is its way less dorky looking.


I wouldnt buy a new crankset or fd as its not neccesary.

Will G 03-08-07 07:25 PM

I had a 52/42/30 with a 12-25 cassette and I never used the 30 chainring so I swapped out my 105 triple for a double Ultegra 6500 crank. It doesn't have the external bearings so I had to get a new bottom bracket. I readjusted the limit screws on the FD and it works great.

Al1943 03-08-07 07:59 PM


Originally Posted by barba
You can if you set the limit screws correctly, but I see little point. The weight savings are small and a standard double crank's small ring is 39t. Your's would be a 42.

As the OP said, the middle ring in the 10-speed 105 triple is a 39. The big ring is a 50. For racing it may make sense to change the 12-27 cassette to something like a 12-23, or even an 11-21, depending on the race course. Not much reason for a first year racer to change a triple to a double. If anyone laughs at that triple drop 'em on the next climb.

Al

DanteB 03-09-07 12:45 AM

Oh, I thought you were trying to figure out how to cut a triple century down to a double century.

derath 03-09-07 06:03 AM

Seems kinda pointless.

Weight savings. You can make a bigger difference just taking a **** before the race.
Otherwise, I am amazed how much money people will spend to "look cool"

-D

barba 03-09-07 07:13 AM


Originally Posted by Al1943
As the OP said, the middle ring in the 10-speed 105 triple is a 39. The big ring is a 50. For racing it may make sense to change the 12-27 cassette to something like a 12-23, or even an 11-21, depending on the race course. Not much reason for a first year racer to change a triple to a double. If anyone laughs at that triple drop 'em on the next climb.

Al


Pardon me, I missed the 39t middle ring. That seems a bad move by Shimano. I love the 42t ring and find it one of the more versatile things in cycling. Besides, it is already a triple; why gear it down?

superslomo 03-09-07 07:19 AM

Either an Ultegra triple (which is 52-39-30, IIRC) or a different cassette (better, quicker, and cheaper) might be an easier fix.

I have a triple which is 52-42-30, and I'm also a little puzzled by the decision to go with the newer "compact triple" sort of setup... 50-39-30 seems a little odd, and takes away a big portion of the upside of the triple to begin with.

Phantoj 03-09-07 11:02 AM


Originally Posted by derath
Seems kinda pointless.

Weight savings. You can make a bigger difference just taking a **** before the race.
Otherwise, I am amazed how much money people will spend to "look cool"

-D

Isn't evacuating your bowels before a race a good idea regardless of what kind of crank you're running?

cocoasprinkles 03-09-07 11:08 AM

Will Tiagra shifters work when the crank is changed from triple to double?

Nashbar has a good deal on a 105 Double with BB for less than a $100 and it's black i believe.

barba 03-09-07 11:11 AM


Originally Posted by cocoasprinkles
Will Tiagra shifters work when the crank is changed from triple to double?

Nashbar has a good deal on a 105 Double with BB for less than a $100 and it's black i believe.

I would think of that as a downgrade. He has the newer 10 speed 105 with external bearings. The one at Nashbar is the older 9 speed model that uses an Octalink BB. It isn't that the 9 speed era 105 is bad (I use it), it is just that the 10 speed stuff is really quite nice and newer technology.


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