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1x Gearing for Paris Roubaix Sportive

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  • March 21, 2019 at 8:56 pm #29456
    K Ross

    I’m riding the 172km Paris Roubaix Sportive in April and was looking to use SRAM 1x with 40T x 11×32 cassette. Do you think a 44T chainring would be better, as there’s still over 120km of road to ride? Just didn’t want to spin out. Would like to know your thoughts?  

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  • March 22, 2019 at 8:50 pm #938143
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    Chris Hayes

    Paris-Roubaix is pan flat.

    Paris-Roubaix is pan flat.  If it’s any help, I’ll be riding 53/39-25/11.  You might want to try riding in a high gear over the ‘cobbles’ (which is a ridiculously quaint word for what you’re going to encounter) – but this is difficult to maintain for mere mortals. You certainly won’t need your lower gears.  

    I’d worry more about spoke-count; tyres (25mm+ and tough – Conti 4 Seasons); bar tape (or gel inserts); adjusting your chain so it doesn’t come off (more likely with a 1x group set?); taking spare spokes; old fashioned bottle cages you can bend in; and whether your gloves are comfortable (i.e. no pressure points).  Enjoy. I cried when I finished it first time. It was 212km. I used Bernard Hinault’s shower cubicle. 

    March 22, 2019 at 8:01 pm #938141
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    Welsh boy
    BehindTheBikesheds wrote:
    I know that 39×11 will do me for 30mph, that’s only 107rpm on 28mm tyres/172.5mm crank length

    Why do you mention crank length, it has no bearing whatsoever on gear size. 

     

    In in response to the original question, why do you want such a low bottom  gear for what is basically a flat ride?  I would have thought that a narrower range cassette giving you smaller jumps between gears would be a good idea. 

    March 22, 2019 at 7:08 pm #938139
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    Jimthebikeguy.com

    Narrow wide not even open to
    Narrow wide not even open to debate in this case, and usually either included with a sram chainset anyway, or real cheap from somewhere like super star components. Must have.

    March 22, 2019 at 5:23 pm #938137
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    cmcg867

    BehindTheBikesheds wrote:

    BehindTheBikesheds wrote:

    Don’t worry about a ‘wide-narrow’ ring, waste of time and money, not seeing any evidence that a std ring will ship the chain. 

    Well, yes. But also no.

    Double ring yeah no issues.

    Single ring? Narrow-wide is essential IMO. I’ve tested every combination of narrow-wide or standard chainring with standard and clutch mech and the single most important part is the narrow-wide ring for chain retention.

    Source: too many dropped chains.

    March 22, 2019 at 3:42 pm #938135
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    fukawitribe
    BehindTheBikesheds wrote:
    Don’t worry about a ‘wide-narrow’ ring, waste of time and money, not seeing any evidence that a std ring will ship the chain. 

    No, not vital but…

    (a) He’s going on the PR cobbles, not your average British road, plenty of folk have recommended chain catchers, clutch mechs or NW rings for it in the past.

    (b) They work

    (c) They’re cheap and sounded like he’s getting a new ring anyway

     

    March 22, 2019 at 1:22 pm #938133
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    Anonymous

    You might want to fathom out

    You might want to fathom out what you feel comfortable with cadence wise, I’m a biggish chap and I don’t find any problem at all doing 100+rpm, you might well find you can do 120rpm before truly ‘spinning out’.

    I know that 39×11 will do me for 30mph, that’s only 107rpm on 28mm tyres/172.5mm crank length, I probably will have shifted onto the biggest ring beforehand but if only having one ring then I could cope with a 39, even the 12T sprocket would give you 27.6mph @107rpm, a 40/11 is 31mph at the same rpm.

    At 120rpm 40/11 is 34.7mph, unless you have some lngish and fairly steep downslopes then you won’t need bigger than a 40 IMHO and a 44 is simply unecessary, IF you can pedal at anything around the 110 rpm mark.

    Don’t worry about a ‘wide-narrow’ ring, waste of time and money, not seeing any evidence that a std ring will ship the chain. 

    Have a great ride.

    March 22, 2019 at 10:37 am #938131
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    fukawitribe

    40, 42 or 44 should be fine –

    40, 42 or 44 should be fine – depending on your strengths you might spin a bit with the 40 if you’re in a big-ish group on the flat, but 40 x 11 @ 90 rpm is ~42km/h already. I guess a 44 might make the chain-line a bit better, getting a narrow-wide is probably more important though, dunno – love to, but not done PR (yet). Here’s a quick couple of figures.

     

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