Deore cassette on Tiagra derailleur
#1
Junior Member
Thread Starter
Join Date: Feb 2011
Location: Seattle, WA
Posts: 24
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Deore cassette on Tiagra derailleur
Amazon seems to sell an 11-34T "HG-50" Tiagra cassette. See here. But if you look on Shimano's website, such a thing does not exist! Once I add to cart, I see that this is really a Deore cassette.
Can I use it on my Tiagra rear derailleur? I'm talking plug-and-play, no modifications to anything. The Shimano website says the maximum sprocket for the Tiagra is 27T but I'm confused about the whole Amazon thing. There seem to be a lot of positive comments. Or should I just get one of the real Tiagra options?
Thanks.
Can I use it on my Tiagra rear derailleur? I'm talking plug-and-play, no modifications to anything. The Shimano website says the maximum sprocket for the Tiagra is 27T but I'm confused about the whole Amazon thing. There seem to be a lot of positive comments. Or should I just get one of the real Tiagra options?
Thanks.
#2
Senior Member
Join Date: Jul 2011
Posts: 202
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Your current derailluer may not have enough reach to take up the slack when running small chainring/small cassette cog and/or your chain may not be long enough for large/large configuration. It might work ok if you are careful about never crosschaining when you shift, but I don't think dropping in a 34T cassette is recommended.
#3
Bicycle Repair Man !!!
If you want to run an 11-34 cassette you will need a derailleur that can handle the larger cog and complete range of your bicycle's transmission.
Rating of the Tiagra is 27/22/37 which means it can optimally handle a 27 tooth cog in the rear, 22 tooth difference up front, and has a maximum capacity of 37 which is calculated by adding the difference between the largest and smallest chain ring to the difference between the largest and smallest rear cogs.
With that being said the Tiagra GS can probably handle a 30 tooth cog with no problems but think that it will be hard pressed to run a 34 as long cage road derailleurs are the equivalent of medium cage mtb derailleurs.
If you want Alpine gears a long cage mtb derailleur should be used.
Rating of the Tiagra is 27/22/37 which means it can optimally handle a 27 tooth cog in the rear, 22 tooth difference up front, and has a maximum capacity of 37 which is calculated by adding the difference between the largest and smallest chain ring to the difference between the largest and smallest rear cogs.
With that being said the Tiagra GS can probably handle a 30 tooth cog with no problems but think that it will be hard pressed to run a 34 as long cage road derailleurs are the equivalent of medium cage mtb derailleurs.
If you want Alpine gears a long cage mtb derailleur should be used.
#4
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
Your current derailluer may not have enough reach to take up the slack when running small chainring/small cassette cog and/or your chain may not be long enough for large/large configuration. It might work ok if you are careful about never crosschaining when you shift, but I don't think dropping in a 34T cassette is recommended.
Thread
Thread Starter
Forum
Replies
Last Post
jockstick
Road Cycling
14
12-13-18 03:16 PM
CycleUpperLeft
Bicycle Mechanics
12
06-01-14 02:37 AM