Time Trial / Time Trialling / TT

First Club 10TT this year and it was Snowing when we set off :( bloody cold and slippery greasy roads I left all my jackets on over the skinsuit today.
48 x 13 on 23c tyres is about 97-99" gear too big for the weather but c.b.a to change it.
27:30
http://app.strava.com/activities/43851232#

Tester or others; what are the best, but acceptably priced clip on bars?

Tester or others; what are the best, but acceptably priced clip on bars?

Start about £32 James look at the TT forum for sale section too
Aero bars at Wiggle

Thanks steve.

Worth keeping an eye on ebay, I picked up a set of deda clip ons and a profile base bar for 35 quid

What's the deal with these?
http://www.chainreactioncycles.com/Models.aspx?ModelID=78775

And what should I look out for?

I've got them. They've got a 26mm clamp diameter. I bought the Vision base bar and a vision 26mm stem to go with them. The vision base bars take a non-standard brake lever so can be problematic/expensive to find levers for. I've not put levers on yet.

Ah yeah. That's why they're dirt cheap.

Normal clamp size it is.

Tester or others; what are the best, but acceptably priced clip on bars?

The ones which suit you for comfort and position, and also fit your base bar.

Profile T2 is bomb proof and adjustable, loads of extension shape options, but they weigh a ton. Deda Parabolica are light and cheap but less adjustable and the pads aren't as luxurious. If you're new to tri bars, expect to go through several sets before you find a happy set up, and don't be surprised if you end up with a mongrel system mixing pads, clamps and extensions from 3 different manufacturers.

I just wanted something to put on the turbo bike to try and get adapted to riding that way. So when I get a TT bike at somepoint, I'm not un-used to it.

Thanks though.

I just wanted something to put on the turbo bike to try and get adapted to riding that way. So when I get a TT bike at somepoint, I'm not un-used to it.

Thanks though.

I'll ask Peter Hayes if he still has the club set, I have an old cheap set you can borrow that I am not using at the moment.

Top one. That'd be great.

If the spokes are the same, I wouldn't be so sure that the DP18s are actually more aero

Not sure how much to read into this 'testing'. Same as a HED Jet.. for realz?

"I do have an old test of Tour's taken with an SRM, where a 30mm Rigida DP18 rim performed quite well, though not the best of course.

Watt
45 km/h

Disks: 352,00
Shamal HPW 12: 364,00
Cosmic: 366,00
Citec 12 Spokes: 367,00
Spinergy: 369,00
HED Jet: 375,00
Rigida DP 18: 375,00
Spengle Tri-Spoke: 376,00
Shamal FW/36S BW: 385,00
Corima VR/ 36S BW: 388,00
Standard 36S: 403,00"

http://www.biketechreview.com/index.php/forum/1-general-discussion/13063-deep-aero-wheels-vs-aluminum-rims-field-tests#13112

Presumably at zero yaw, and how many of what kind of spokes in the DP18? The spokes tend to dominate where the rim is doing no more with the airflow than trying to keep out of its way

Just in the process of entering this: http://cyclingtimetrials.org.uk/Default.aspx?&ge514__geka=8sW2Q7VKZmF8CUWP7ygm7riwpLFKNCEAIlX03Hp4_FhPDrktfqfkoQzxx15QQk__xHPLqh7iw6GhFuQIYBC-kw&ge514__gevi=XCpJGZoOsdoc9IDgR3GP4g&gv850__gvac=2&gv850__gvff0=58210&gv850__gvfl0=0&tabid=361

Turns out I couldn't enter this as my club (Uni of Manchester CC) hasn't paid its CTT affiliation for this year. Nice of them to cash my cheque anyway.

Hmmm, I wonder if I'll be able to enter then, as my uni CC is definitely not affiliated...

How should the stack and reach of a TT bike comare to a road bike.
Do i want to be a few hundred mm shorter on reach?

My bikes:
TT bike stack 482 reach 405
Road bike stack 570 reach 406

TT bike slammmed, effective stem length 100m × -17°, 60mm spacers between base bar and elbow pads
Road bike 20mm conical spacer and a 110mm × -10° stem, bar reach 79 drop 130

See all those variables? That's why there's no right answer to your question, before we even get to how your particular body transitions from a road position to a TT position. What you have to do is find out where your elbows need to be and work back from there to a headset location which gives a legal position which also handles nicely, both on the tri bars and on the base bar. Apart from the carbonliciousness and aeros, the best thing about changing from the Koga to the T3 was that I dropped the base bar by 40mm without changing any other contact point; not a dimension many people give much thought to, but it improves the bike a lot for all those times when I'm holding the base bar.

I'm often found near low bass, propping up the bar.

I'm often found near low bass, propping up the bar.

Oh you always make things so simple.
Beyond trial and error, how can it be calculated.

Can i use the road bike position, find where I like my elbows, tt style, and use that measurement?

Oh you always make things so simple.

You want a simple answer, but there isn't one. Until you know exactly where you want your contact points, you can't know what shape the frame needs to be. Once you do know your contact points, and preferably which tribars you're going to use since they have their own stack and reach dimensions, the frame shape just falls out of the calculation as a simple pair of numbers, which have no fixed relationship to the corresponding numbers on your road bike.

Yeah I do get that it's far from simple, even with experience.

But for instance, how would I decide if I get a L or XL planet x exocet. Or is it just trial ad error.

You probably don't get any Exocet until you know what you want. Try to find a cheap steel or aluminium road frame that's about 10% smaller than your road bike (e.g. 50cm if your road bike is 55cm) and experiment with some cheap tri bars and a few different stems.

A week ago you were here

I just wanted something to put on the turbo bike to try and get adapted to riding that way. So when I get a TT bike at somepoint, I'm not un-used to it.

and now you're thinking of buying a carbon TT bike?

Either we're missing some information about you or you're missing the 3 years or so it will take to learn to ride a time trial and adapt to a TT position.

But thanks for the top one, that along the lines of my thoughts up a few posts up.
And I used the Exocet as an example, as the l and XL are similar sizes in tt terms but with a difference in stack and reach.

Oh and with regards to the getting used to it comment I meant close elbows. My road position is very aggressive with near flat back when laid out. So I'm flexible, but just not used to close elbows. I'll ride tt style on the road when I'm alone, but not for long periods, it's not secure just hanging over the bars.