preferred-google-button
log in
register

2.5mm – Will I notice a difference?

  • Creator
    Topic
  • January 29, 2014 at 10:04 pm #20601
    jasonm945

    I am 5’11” and currently run a 172.5mm crank set. So my question is would I notice a difference if I replaced it with a 175mm.

    I have 175 on my MTB and don’t see that as different, so would it just take a few rides to settle in?

    Thanks in advance.

    Jay

  • Creator
    Topic
Viewing 15 replies - 1 through 15 (of 22 total)
1 2
  • Author
    Replies
  • February 2, 2014 at 1:28 pm #771259
    0
    big mick

    Just think if you moved your
    Just think if you moved your saddle 2.5mm forward.It feels like a foot.I have long legs and went from 170 to 180 and when climbing can push a higher gear with ease for the same heartrate.I think it’s down to length of your legs I’m 6ft4ins if I was 5ft 165mm cranks would be better.

    February 1, 2014 at 10:10 pm #771257
    0
    Giles Pargiter

    Like many others here. I have
    Like many others here. I have run crank lengths from 170 to 175mm and can’t say I notice any difference.
    You might want to adjust your saddle height slightly if you did go from 70-75 but 2.5mm is about like a thick pair of socks, as mentioned. Have to say I do adjust my saddle height between wearing approach boots, sandles or bare feet though.

    February 1, 2014 at 3:11 pm #771255
    0
    lolol

    I read an article recently
    I read an article recently where they tested crank lengths to see if there was a performance difference, there wasnt any. The crank is only one part of the lever along with the gears themselves, the only difference was noted at real extremes, like 200mm cranks.
    You might notice for the first hour, just because its different, but after that you’ll be fine.

    February 1, 2014 at 11:51 am #771253
    0
    harrybav

    You could try running one
    You could try running one side at 172.5 and the other at 175, on the basis that most people’s legs are different lengths.

    February 1, 2014 at 10:41 am #771251
    0
    sm

    Just to add to the chorus of
    Just to add to the chorus of no answers. I switched and no, I did not notice the difference. But then I did compensate by wearing four pairs of padded shorts.

    January 30, 2014 at 3:58 pm #771249
    0
    jasonm945

    harman_mogul wrote:Your hip

    harman_mogul wrote:
    Your hip joints are articulated less on shorter cranks. If you are getting on a bit you might want to think about that. They do wear out in the end.

    Is 43 getting on a bit?

    January 30, 2014 at 3:56 pm #771247
    0
    harman_mogul

    Your hip joints are
    Your hip joints are articulated less on shorter cranks. If you are getting on a bit you might want to think about that. They do wear out in the end.

    January 30, 2014 at 3:04 pm #771245
    0
    HLaB

    I had 175mm cranks on one
    I had 175mm cranks on one bike 172.5mm on another and I did notice a difference injury wise, but I think I had my saddle too high; so whilst on the 172.5mm cranked bike my seat height was almost ideal the same saddle height on the other (175mm cranked bike) was fractionally too high. Gradually it felt like my calf was being pulled too much; I moved the seat down 2.5mm and forward 2.5mm and the feeling went away and I can’t say I noticed a difference after that.

    More recently I run 172.5mm cranks on my two bikes and 170mm on the fixie and I cant say I notice a diference there either.

    January 30, 2014 at 2:44 pm #771243
    0
    MattT53

    I have 172.5 on one bike and
    I have 172.5 on one bike and 175 on another. Can’t say I ever notice a difference.

    January 30, 2014 at 1:05 pm #771241
    0
    jasonm945

    It’s my RH crank arm, I have
    It’s my RH crank arm, I have tapped it and lost the first 5mm or so of thread. My other option is to get them Helicoiled which seems silly as they are FSA Gossamer cranks so an upgrade was on the cards anyway. 👿
    I do figure I don’t need an excuse to upgrade but as excuses go, I’ve stripped my threads, is quite high on the list 🙂

    Jay

    January 30, 2014 at 1:02 pm #771239
    0
    lookmanohands

    2.5mm about the same as a
    2.5mm about the same as a pair of thick winter socks!

    January 30, 2014 at 12:58 pm #771237
    0
    dunnoh

    jasonm945 wrote:I’m not just

    jasonm945 wrote:
    I’m not just changing for the size, I have knackered the thread in one of my pedal arms by not tightening the pedal in and riding 15 miles till it fell out!

    I have seen an excellent deal on a SRAM force chain set but can only get it in 175mm, hence the question.

    I believe I’ll notice it for a ride or two and then forget about it but wanted to check if this is correct or not.

    I did that. Got it re-threaded and its been fine for 2000+ miles. If that doesn’t work they can drill it out put and put a new screw in thread that gets bonded. The pedal screws in as normal

    January 30, 2014 at 12:57 pm #771235
    0
    Anonymous

    Why not just get the thread
    Why not just get the thread in the crank arm repaired..? or ebay it (LH ones should be easy and cheap to obtain if that’s the side in question).

    January 30, 2014 at 12:17 pm #771233
    0
    Anonymous

    Isn’t crank length supposed
    Isn’t crank length supposed to be related to shin length?

    January 30, 2014 at 11:41 am #771231
    0
    arrieredupeleton

    You wont be able to get your
    You wont be able to get your knee down so much during those 100mph Crit races. Other than that…you’ll probably not notice after the first minute.

  • Author
    Replies
Viewing 15 replies - 1 through 15 (of 22 total)
1 2
  • You must be logged in to reply to this topic.