If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)

Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Compact chainrings upgrade

Signal_ rabbit · 2013-04-20 17:19:04

Okay i run a compact Shimano 50/34 and an 11-28 on the back. I want more top end, can I just change the front rings to a 52/39? Is it that simple?

20-04-2013 05:19PM

#1

Signal_ rabbit

Registered Users, Registered Users 2 Posts: 682 ✭✭✭

Join Date: August 2008

Posts: 586

Okay i run a compact Shimano 50/34 and an 11-28 on the back. I want more top end, can I just change the front rings to a 52/39? Is it that simple?

0

Comments

#2 20-04-2013 05:25PM

paulieb2006

Registered Users, Registered Users 2 Posts: 192 ✭✭

Join Date: March 2010

Posts: 162

What chainset do you have?

0
#3 20-04-2013 05:28PM

Signal_ rabbit

Registered Users, Registered Users 2 Posts: 682 ✭✭✭

Join Date: August 2008

Posts: 586

Tiagra

0
#4 20-04-2013 05:34PM

colm_gti

Closed Accounts Posts: 2,505 ✭✭✭

Join Date: March 2011

Posts: 2318

Presumably a compact chainset....you're very limited with regard to 53/39 chainrings unfortunately. You can get these in a 53/39 that will fit a 110mm bolt circle (compact).

Otherwise your best bet is to buy a shimano hollowtech 2 full double 53/39 chainset and sell yours to fund it. Assuming your tiagra is the most up to date (10 speed), it should be a direct swap with regard to the bottom bracket. You will need a longer chain and you'll have to adjust your front mech.

0
#5 20-04-2013 07:06PM

DirkVoodoo

Registered Users, Registered Users 2 Posts: 11,510 ✭✭✭✭

Join Date: February 2002

Posts: 11210

A 50-11 will get you up to 57 Km/hr.

If you need more "top end" I'd imagine it's on descents and slight inclines, in which case you can get some gains for free, by working on your aerodynamics first.

0