Roisin Kelly
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  • Sydney
  • Australia
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Roisin Kelly's Discussions

Rack on a carbon bike

Started this discussion. Last reply by Common Old Garrwain Mar 14. 18 Replies

Hello fellow riders - I have a carbon bike and I’ve attached a rear rack. As background for the curious, I bought this bike (a Giant Avail) years ago and I barely ride it. My ‘real’ bike, a standard…Continue

Helmets

Started this discussion. Last reply by Kathy Francis Mar 22, 2013. 82 Replies

...if you really can't fathom or understand riding without a helmet, can I please request you close this entry and ignore it. I've been cycling in Sydney since about 1994 and I've never worn a…Continue

Bourke Road Cycleway - Report

Started this discussion. Last reply by JimmyH May 9, 2012. 10 Replies

Sydney City Council currently has the report on the Bourke Road cycleway in Alexandria on public exhibition. The report says the cycleway has positive and negative points and it recommends some work…Continue

 

Roisin Kelly's Page

Latest Activity

Common Old Garrwain replied to Roisin Kelly's discussion Rack on a carbon bike
"Yes that's a good point, I suppose those frames are relying on the additional strength of the seatpost itself and a precision fit into the seat tube to make that area reliable. From the photo above, it looks like the clamp is very broad, and…"
Mar 14
Snowy_5 replied to Roisin Kelly's discussion Rack on a carbon bike
"I have a carbon roadie and I will never use a rack on my carbon bike but only on my alloy flat bar bike. My carbon roadie have an alloy seat post clamp.so do other carbon roadies have it. If you want the rear rack on yours, then do it at your own…"
Mar 13
mikesbytes replied to Roisin Kelly's discussion Rack on a carbon bike
"My carbon frames have no metal at the seat post clamp.  I'm a little concerned as to what forces the carrier may apply to the clamping area of the frame"
Mar 13
Peter Hoskins replied to Roisin Kelly's discussion Rack on a carbon bike
"I pondered this long and hard, I went for a TI frame as I am not convinced about bending resistance in carbon in forks. they are not designed for such loads. Great for racing"
Mar 13
James Gray replied to Roisin Kelly's discussion Rack on a carbon bike
"The seatpost can bear a good amount of weight but the real advantage of attaching it to the seatpost would have been that it's a readily replaceable item in the event of failure. For a 'normal' round alloy seat post I doubt there…"
Mar 13
James Gray replied to Roisin Kelly's discussion Rack on a carbon bike
"Good find snowy, that looks like an excellent solution."
Mar 13
Common Old Garrwain replied to Roisin Kelly's discussion Rack on a carbon bike
"The two upper arms are greatly multiplying the force needed to stabilise the rack because they are a long way from being horizontal, this means the bending moment on the seatstays could be considerable even with a light load and avoiding bumpy…"
Mar 12
Scientia et Labore replied to Roisin Kelly's discussion Rack on a carbon bike
"I have used OMM racks for years, on brutal rides. 26" in my case however they have charbon-roadie versions That said Roisin, your remark about seeking a bike meant for utility work makes sense. I did that, German made Dutch bike does the work…"
Mar 11
Roisin Kelly replied to Roisin Kelly's discussion Rack on a carbon bike
"Good stuff James - thank you. I'm carrying light loads (less than 10kg) and doing my best to avoid every damn hole I see. Can I ask about my real worry? I understand bikes are designed for vertical loads and that lateral loads / impacts can be…"
Mar 11
Snowy_5 replied to Roisin Kelly's discussion Rack on a carbon bike
"Your rack carries a maximum load of 25kg. Carry more than that will break/crack it. There`s an QR adapter set for rack without eyelet mounts. Google to find other stores for prices. Wiggle is out of stock at the moment. And you`d need…"
Mar 10
James Gray replied to Roisin Kelly's discussion Rack on a carbon bike
"Sorry to say I think this is a Really Bad Idea™. Those seat stays are designed to carry loads along their axis, you're introducing shear loads to them, perpendicular to the axis, which they are not made for. The clamping force you can…"
Mar 10
Roisin Kelly replied to Roisin Kelly's discussion Rack on a carbon bike
"Thanks heaps for your replies. With further googling after your comments I plan to keep an eye on it and tap regularly with a coin to, apparently, ensure a clear hollow sound for intact fibres. I'm feeling a little uneasy about it…"
Mar 9
Jon replied to Roisin Kelly's discussion Rack on a carbon bike
"Will they put their money where their mouth is and replace a broken frame?"
Mar 9
Duncan replied to Roisin Kelly's discussion Rack on a carbon bike
"well - Thule specifically say 'works with any type of frame material' on their website. As others have said - don't overdo the seat-stay clamps, failure will be catastrophic (not buckling) "
Mar 9
JP replied to Roisin Kelly's discussion Rack on a carbon bike
"I have the same rack but it's on an alloy hardtail. There is ample rubber cushioning between the rack and the frame and you can achieve even tension with the straps. Mate, I'd contact Thule and ask them what they recommend."
Mar 9
Peter H replied to Roisin Kelly's discussion Rack on a carbon bike
"I would also recommend getting a rack that attaches to the wheel bracket (official name unknown). This bracket is not carbon and is designed to take a lot of forces. Having the rack attached the the bracket will transfer the downward forces directly…"
Mar 9

Profile Information

What sort of riding do you do ?
Commuting, Whatever
Where in Sydney do you live ?
Drummoyne
Tell us about your bikes
My bike is an extension of my body
About Me:
just one

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