I have 45deg extensions at the moment but when my shifter came loose I accidentally snapped off a bit of my grip. Ive reinserted the shifter and it seems to mostly grip the aluminium bit of the bar. After an hour and a half training and a race it seems good. So I am in no rush to replace my 45deg extensions but if I do do you think its worth going for 35deg ones? Lol, it would move the Garmin further from my face and make it easier to read.
You are pretty high in frontâŚif moving to 35* bars will let you lower yourself in front, than it would be worth it. If you are going to keep your upper body position the same, then donât do it since it will only open the gap between your face and your hands, likely increasing drag.
So when I change the for-aft of my saddle by 3mm, the saddle heigth goes 1mm up or down respectively, right?
Is the opposite also true? If I go up 1mm, my saddle effectively goes back 3mm?
I recently increased my saddle heigth by 2mm, does this mean my setback changed by 6mm and I should move my saddle 6mm forward?
But wouldnât that mean a 2.5mm change in the horizontal position would amount to a 9mm difference in saddle heigth? Iâm pretty sure Iâm completely missing something, but canât figure out what it is.
Correct. Your initial post was the wrong way round. You raised your saddle 2 mm so you need to move it forward <1 mm to keep your leg extension the same.
Why did you increase the height? If it was to increase extension donât adjust the fore and aft.
The Fore and aft position is about balance and postural stability (or terrain compensation). Are you balanced? Steve Hoggâs website is worth a read to find out more.
I think you all have this covered well. For future reference, here is the separate topic I wrote a while ago. It contains a graphic that might help with the visualization too.
No, thatâs not the case at all. Perhaps you are getting mixed up with units (mm/cm) and the related delta?
Take this example:
700mm saddle height at 73*, then shift 3mm directly rearward horizontal. It effectively lengthens the saddle height (all else being equal) about 1mm (not 10mm / 1cm like you said)
As I said, Iâm completely failing a geometry, but how can these two statments both be true:
If I increase my sadddle heigth by 1cm, saddle goes back 3mm.
However
If I change my aft by 3mm, saddle goes up by 1mm.
I would have thought that only one of these statements and the according inverse could be true.
I think my mistake is that I apply the same ratio to both changes, but basically a for-aft change doesnât change saddle heigth on the same ratio as a saddle heigth change does change for-aft. Right?
This is about âwhoâs driving the busâ sort of thing.
If you Raise or Lower the Saddle, the Fore-Aft distance change is roughly 1/3 that height change.
Raise Saddle 10mm = Fore-Aft changes 3mm
If you move the Saddle Fore-Aft, the Height distance change is again, roughly 1/3 that height change.
Shift Saddle Aft 10mm = Height changes 3mm
I am probably not explaining well, and as a visual learner, the graphic above is easier for me to understand. So I am likely failing in a verbal definition, but see if this most recent attempt in text helps at all.
In short, the primary change you make only impacts the related value by a smaller proportion of that primary change.
Are there resources on fitting cleats. I have a sensitive knee and I got new shoes and canât quite get the clear in a comfortable position. I could find tidbits on some adjustments based on what Iâm feeling but not enough to get them set properly.
I didnât finish the 2nd diagram, because the seat moves along the seat tube and length increases by the amount you raised it (assuming measurement marks are on seat post):
@pnzr I think to help us explain the relationship you still need to answer the question about why you increased your saddle height?
The ratios that weâve been discussing are for maintaining the same leg extension when making adjustments.
When fitting we tend to look at saddle height first to find the most effective position for power production. When we come to consider the fore and aft position weâre looking to find the best postural stability and balance. So if we find optimum height first but then we adjust fore and aft to improve stability, we adjust the height again using that ratio to keep the extension the same.
I had some knee issues, but Iâm not sure itâs saddle heigth related. Might have been too wide of a Q-factor, but have to see how the long weekend ride goes the day after tomorrow.
