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Fitting Your Bike Are you confused about how you should fit a bike to your particular body dimensions? Have you been reading, found the terms Merxx or French Fit, and don’t know what you need? Every style of riding is different- in how you fit the bike to you, and the sizing of the bike itself. It’s more than just measuring your height, reach and inseam. With the help of Bike Fitting, you’ll be able to find the right fit for your frame size, style of riding, and your particular dimensions. Here ya’ go…..the location for everything fit related.

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Old 03-17-17, 08:41 AM   #1
boshk
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Beginner, feels like I am sliding forward

Got myself a Specialized Diverge DSW, all stock parts.

Only ridden 7 times but every time I feel like I am sliding forwards and always end up having to push myself backwards on the saddle. It doesn't happen constantly, maybe after 10mins riding I feel I need to get off saddle and move my butt back.

Read a few forum, some suggest I move the saddle back??..and then some suggest forward....

I've climb a hill back home twice, pedalling in seat, I don't have the 'slide forward' problem, only on flat-ish roads.

LBS did a basic fitting for me....
Saddle height with heel on pedal with crank vertical
knee in line with toes when crank is horizontal

I did however reverse the stem to allow for a more comfort ride/geometry
I put a spirit level on saddle and it looks level
saddle is as in line with bike as I can get it

I try as hard as I can to distribute my weight on saddle, handlebars and pedals evenly.....pedals are the hardest part

any thoughts or suggestions?
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Old 03-17-17, 09:28 AM   #2
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Move the saddle back, readjust saddle height. You should be balanced so that you can briefly remove your hands from the bars. Your hands should feel light on the bars.
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Old 03-17-17, 09:40 AM   #3
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Try tilting the saddle back just slightly above level.
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Old 03-18-17, 07:44 PM   #4
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Tilt the saddle rearward. It really is okay, especially for some saddles and some anatomies, to have the nose higher than the rear. Some people have difficulty with saddles and will go through many before they find something that will work. Others, me, can ride and be happy on about anything and I use and prefer unpadded cycling shorts at that. J
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Old 03-19-17, 07:16 PM   #5
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cant tilt the saddle, I'm still using the stock saddle from Specialized.

I moved it back 4mm, see what happens.

Also, I get this uncomfortable feeling down there on the right side/one (haha) after about 30mins riding, maybe its the bibs shorts? saddle?

anyway, trying the 4mm back today, shorts I'll try another pair and see.

Anyone use a Fizik saddle? Antares or aliante?

Last edited by boshk; 03-20-17 at 03:21 AM.
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Old 03-19-17, 09:44 PM   #6
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I am sorry, I guess I am misunderstanding your issue. I have never heard of a saddle that cannot be tilted up or down on the seat post. Well, actually, it is the seat post that allows the tilting. Hope you figure it out. J
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Old 03-20-17, 02:55 AM   #7
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Quote:
Originally Posted by boshk View Post
Read a few forum, some suggest I move the saddle back??..and then some suggest forward....

Saddle further back makes it easier to brace the weight of your upper body against the pedaling forces.


But if you leave the bar in place, it also forces you lean/stretch more forward.


So the fix depends on what's your limiting factor.


If you slide forward (mainly) b/c pedalling effort isn't enough to keep you in position, then moving saddle back can help.


If you slide forward (mainly b/c your upper body is dragging you forward due to reach/flexibility issues, then saddle forward can help.


Since you also say:
Quote:
Originally Posted by boshk View Post
.....pedals are the hardest part

I suggest both saddle rearwards and a shorter stem.


Quote:
Originally Posted by boshk View Post
... I try as hard as I can to distribute my weight on saddle, handlebars and pedals evenly.....pedals are the hardest part

That'll come with increased fitness.

Last edited by dabac; 03-20-17 at 02:58 AM.
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Old 03-20-17, 03:01 AM   #8
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There's lots of online tutorials on how to achieve a good fit on your bike, definitely worth spending half an hour on you tube
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Old 03-20-17, 03:21 AM   #9
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Quote:
Originally Posted by Loose Chain View Post
I am sorry, I guess I am misunderstanding your issue. I have never heard of a saddle that cannot be tilted up or down on the seat post. Well, actually, it is the seat post that allows the tilting. Hope you figure it out. J
yea, just figured that out, I watched a few video and most seatpost (I'm guessing aftermarket ones) have dimensions/indicators on them.
I'm still using the stock seatpost and saddle, the saddle bars have indicators on....so I moved it 4mm back.
The seatpost itself only has forward and aft screw which I assume is the tilter....but no indicators so I left it as neutral/level as I could get it for now. I wouldnt know how many degrees I'm tilting if I tried.

So far after today's 80mins ride, it feels way better, less sliding forward but I did a few times which I think its me pulling on the bars.

Last edited by boshk; 03-20-17 at 03:31 AM.
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Old 03-20-17, 09:35 AM   #10
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Quote:
Originally Posted by boshk View Post
yea, just figured that out, I watched a few video and most seatpost (I'm guessing aftermarket ones) have dimensions/indicators on them.
I'm still using the stock seatpost and saddle, the saddle bars have indicators on....so I moved it 4mm back.
The seatpost itself only has forward and aft screw which I assume is the tilter....but no indicators so I left it as neutral/level as I could get it for now. I wouldnt know how many degrees I'm tilting if I tried.

So far after today's 80mins ride, it feels way better, less sliding forward but I did a few times which I think its me pulling on the bars.
If you have a smart phone there are apps which are "levels" which you can use to get a baseline tilt on your seat. All you need is the relative position to work from. Even a 1cm change moving the nose up can make a big difference. You want the sweet spot where your private stuff is comfy with minimal sliding forward.
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Old 03-20-17, 07:20 PM   #11
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I have two Brooks B17N and several Specialized Avatar and a Specialized Phenom (love it) among others and every dang one of them has the nose tilted up. I dod not need a level or a protractor to accomplish this. The saddles with the anatomic cutouts seem better able to be set nose up without hurting bits and pieces.

If I did not raise the nose of my B17 saddles I am not sure how I could stay on those slippery devils.
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Old 03-29-17, 03:08 PM   #12
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Quote:
Originally Posted by boshk View Post
yea, just figured that out, I watched a few video and most seatpost (I'm guessing aftermarket ones) have dimensions/indicators on them.
I'm still using the stock seatpost and saddle, the saddle bars have indicators on....so I moved it 4mm back.
The seatpost itself only has forward and aft screw which I assume is the tilter....but no indicators so I left it as neutral/level as I could get it for now. I wouldnt know how many degrees I'm tilting if I tried.

So far after today's 80mins ride, it feels way better, less sliding forward but I did a few times which I think its me pulling on the bars.
Use a carpenter's level. If you don't have one you can buy a small ~8" long one at most hardware or home stores, for cheap.

Better yet, like suggested, get a bubble level app for your phone. I got one and it's actually very handy for checking and adjusting a saddle. I use it all the time, especially when I'm traveling and renting a bike. The actual "degrees" tilted don't matter as long as you are able to see what it is now, then use the level to adjust it a little. My saddle is about "1/2 bubble" tilted up from level. Then, just experiment until it feels right.
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Old 03-29-17, 04:18 PM   #13
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Quote:
Originally Posted by boshk View Post
Got myself a Specialized Diverge DSW, all stock parts.

LBS did a basic fitting for me....
Saddle height with heel on pedal with crank vertical
knee in line with toes when crank is horizontal

...


Also, I get this uncomfortable feeling down there on the right side/one (haha) after about 30mins riding, maybe its the bibs shorts? saddle?
I'm not a bike fitter, I've just read some books on fitting and have an interest, feel free to ignore my post.

The above doesn't describe the reach to handlebars. Might the sliding forward issue be due to the reach-to-stem being too long? When riding on the hoods, are your arms almost locked out in extension/straight, or is your back sore after a long ride? When riding on hoods, look down slightly to see if handlebars superimposed over front hub, this is only a rough starting point.

If your are having perineal/testicle numbness, you are sitting on your soft parts and it doesn't seem like tilting the saddle nose up, even a little, would be a good idea. If you don't know for sure that you are sitting on your sit bones (ischial tuberosities), then have someone teach you. (Sit on the concrete , butt and heels on the ground, lean forward a bit, you are resting on your sit bones and that's where you should feel most of the weight on a bike saddle).


If all suggestions above have been investigated and you are trying different saddles, try a Sella SMP saddle that has a curved depression in the middle. I had a similar "sliding forward" issue and looked into the usual suspects, ultimately a Sella SMP addressed the issue.

Last edited by Flounce; 03-29-17 at 04:23 PM.
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