Pick up the bikes and understand the issue now.
The BB30/Praxis/Infocrank system has a tapered crank shaft, 30mm on the drive side and 28mm on the non drive side. Its also "long" to accommodate the Praxis external cups. Therefore, it won't fit in the PF30 on the TT bike becuase that has a 30mm non drive side bearing (FSA BB30) and of course no external cups. The trick of course is replace the PF30 with the relevant Praxis BB. However this is only sold in this way as a "system" with Infocrank and the shop couldnt convince them to supply the BB separately.
So now the road bike (carbon, snapped chainstay) goes back to Wiggle for warranty inspection, and the TT bike is back in one piece and I'll have to use HR & RPE for TTing.
Edit: But now Ive looked at the Praxis Site the BB for BB30/PF30 seems to be the same one even though the shell diameter is different, so why didnt they move the BB across. *is confused*
Eh? Confused! Is there some sort of insert for different shells?
Wonder why they use a non-standard tapered crank, that's just odd.
Well what do you do when you need a new bb then?
Sounds like a good reason not to buy an infocrank if you can't easily swap them between bikes using different bb systems. Not good customer service from the manufacturer's perspective surely?
http://www.tredz.co.uk/.InfoCrank-Praxis-Works-BB30-PF30-Bottom-Bracket-with-Wave-Washer_92225.htm
?
Thanks schmiken. Good to see that - it qualifies it for the infocrank spindle only which is a pain in the arse, yes MrBlobby it appears Infocrank use a non standard Praxis BB FFS why?
So, im annoyed. Ive found the Bb30 / FSA crankset to be loose - you can move it side to side about 2mm with your hand so its either loose or missing a spacer. Back to the LBS I go, this is poor for mechanics, if I had the right proprietary tool I'd have done the job myself.
And still the question - why didnt they take the Praxis BB out of the Bianchi and stick it in the Boardman?
"simondbarnes - Member
I don't really see the point of buying a TT bike unless you're already doing properly fast times on a standard road bike."
Er, because with a TT bike and some attention to aeroness you can go quick on a couple of hours training a week without the genetics of a husky?
An old good frame, like a P2/P3 or Trek TTX with a threaded BB for £400, and simple aerobars like the Zipps which are easy to adjust (£99 for them I think now, bargain) means you can fettle your position until you barely cast a shadow and ride without a creak. Beats slogging your guts out to go fast.
MrBlobby - I would call that a budget build - ie its a build, based on a budget frame 😉
Thought we'd go seriously "budget" this season. So a set of used but immaculate Hed Jet6/9 wheels running tubeless Corsa Speed tyres#, and a plan for a wheel cover to convert to a disc. I needed a new front wheel so a disc was a little too much.
I was mulling over what to use for the cover, carbon fibre, abs, buy a ready made one (no Raltec anymore), and some measurements showed that I need to discs of only 24 cm radius. A nice tough, material suitable for fashioning into a cover - with low friction?
Teflon!!! Ordered two [url= https://www.procook.co.uk/product/procook-non-stick-oven-liner-50cm-x-50cm ]teflon oven sheets 50cm x 50cm for £9[/url] each to trim down for next week's Hillingdon TT. Will post pictures if they look even remotely reasonable. I'll need an oddly-placed valve cover as the wheel is already very deep, or I could just peel back and retape the cover.
Quite excited by the prospect of some bike DIY - see last thing you made thread 😉
#Note - bought 80 mm tubeless valves, but still needed an extension for the rear - only Stan's are threaded for deep section wheels, but the extender worked perfectly.
Bike Science used to import Wheelbuilder covers. The category is there on their site without any products at the moment, but it may be worth contacting them.
If my diy solution fails I'll import a set. Just playing at the moment. The He'd wheels are a great ride.
You've got me thinking now. There are some really neat examples of DIY discs on the forums.
I'm down to do the 7k at the ECCA festival on Monday. I went to recce the course last weekend and given my current setup (road bike, 45/55mm wheels, clips-ons) I reckon my best possible performance could be about 25-30 seconds off what my clubmates have been doing on their Uberbikes the last couple of years. It's going to need more than just a skinsuit to make that up over 7k. 🙁
(I realise most of the benefit from the mega tt bikes is from the position it allows you to adopt)
The largest size in a single dimension I could find is 50cm, which won't be enough diameter for a 55mm wheel, you could always make two halves from (50x100cm) and then tape them with two seams (I plan on a cone with just the one seam, sealed with Gorrilla tape). I will remove just enough central hole to be a tight fit on the hub, tape drive side internally to spokes, and rim, and tape NDS to just the rim.
There is a site on ebay that will sell you ready cut covers for about £30, which might be more cost effective.
EDIT: And the single biggest change in my position to much more aero has come from fitting a forward (actually a reversed Thomson layback) seatpost and shorter saddle. This rotated me forward to a position not attainable on a road bike with typical geometry.
That's exactly that I use.
This was a few years ago mind. I now have a 130mm adjustable stem that allows me to get lower, and I also rebuild the wheels with deeper rims.
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Looks like 1mm or .8mm ABS sheets can be used. They come in 1.3 x .66m sheets.
I might yet go to ABS, I'm pleased with the initial results and have tested them on the turbo at excessive speeds. A club mate has raised concerns about the structural strength of taping (which I have now tested on a rig), so I'm treading carefully at the moment with regards to field testing.
