Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the February Giveaway for a Reflective Backpack & Spine Protector from RiderBag


Fork problem
#1
Hello, i want to convert my Centurion Ironman Expert into a time trial bike. its a 50cm frame. the problem is i have no idea what length steerer tube i need since i don't know how much thread is actually on the fork. I'm planning on getting a 160mm carbon threaded fork off amazon. do you think it'll work?
  Reply
#2
Considering just the radically different geometry of TT and road bikes and being very blunt: This will be impossible.
And here is why: The best you can achieve is a compromise between a road and a fully aero position. The main problem is that the weight distribution will radically change if you go to a really agressive aero position ( seat angle > 78° etc), making the handling very different, probably even dangerous. You can ameliorate this effect a bit (I guess) by changing the fork geometry (trail and rake), but ultimately this will remain a compromise. Check with an experienced frame builder who knows about stuff like that. Note that this is (in my opinion) the sole reason to change the fork (other than the old one being broken).

Usually a moderate Aero position can be achieved by putting on some aero bars, moving the saddle forward a couple of cm, lowering the handle bar and calling it a day (well, you'll have to play around with all the settings for some rides, eg. trying to clamp the aero bars under the road bar to go lower). The full conversion requires a huge investment (brake levers, base pursuit bar, aero bar, shifters, fork) and will (I fear) not result in a bike that is really a TT bike, but rather have the high risk of resulting in a difficult (maybe dangerous) to ride bike.
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
How to stay safe while biking?
Yesterday 08:55 PM
Chain for specialized rockhopper
Yesterday 08:41 AM
What kind of frame do I have here?
Yesterday 03:01 AM
Restoration of a 1980 Falcon Road Bike
02-26-2021 01:39 PM
New bike
02-26-2021 12:52 PM
Mountain Bike Purchase Advice
02-24-2021 06:33 PM
Pedals: Clip vs. Clipless
02-24-2021 05:33 PM
Just bought a 2021 TREK MARLIN 6 MTB
02-24-2021 05:28 PM
Favorite MTB brand?
02-24-2021 05:25 PM
1983 Trek 720
02-21-2021 08:04 PM

[-]
Top 5 Posters This Month
no avatar 1. Criminal
10 posts
no avatar 2. Jesper
9 posts
no avatar 3. Painkiller
5 posts
no avatar 4. ILv2MTB
5 posts
no avatar 5. nancy joshua
4 posts