Setting a bike up for a turbo

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theboyfold
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Setting a bike up for a turbo

Postby theboyfold » Sat Oct 12, 2019 08:08 am

I have an original Tacx Neo, and since a recent bike fit I've been meaning to get the turbo bike setup correctly.

One thing I have, is the saddle quite far forward, and this is where I'm confused. With the riser block in place, the saddle is 3 cm further back from the BB than I would like. Without the block, it's spot on. The riser is the standard one that comes with the Neo.

So should I setup my bike off the riser? Other than stopping the wheel twisting during the session, what's the purpose of a riser?

Webboo
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Re: Setting a bike up for a turbo

Postby Webboo » Sat Oct 12, 2019 08:22 am

Sorry but I don’t get this. I have a 3 position riser block, one is neutral in that it just makes the bike level. The other two positions lift the front wheel in order to simulate going up hill. The saddle is always in the same position in relation to the bottom bracket and handle bars.

Imposter
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Re: Setting a bike up for a turbo

Postby Imposter » Sat Oct 12, 2019 09:14 am

Putting your bike on a turbo should not alter the position in any way.

theboyfold
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Re: Setting a bike up for a turbo

Postby theboyfold » Sat Oct 12, 2019 09:37 am

This is the trainer that I have

Image

And that's the block I have.

The detail that I might have missed on my first post is that I'm measuring how far behind the BB the tip of the saddle is. the distance that's shown here as '5cm Tolerance'

Image

NOT the height of the saddle.

Imposter
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Re: Setting a bike up for a turbo

Postby Imposter » Sat Oct 12, 2019 09:51 am

Doesn't matter. None of your measurements will be altered by putting the bike on a turbo. The only purpose of a riser block is to compensate for any difference in the rear wheel's height off the floor..

cougie
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Re: Setting a bike up for a turbo

Postby cougie » Sat Oct 12, 2019 10:24 am

Do you change your bike setup when you go up or down a hill ?

theboyfold
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Re: Setting a bike up for a turbo

Postby theboyfold » Sat Oct 12, 2019 10:41 am

cougie wrote:Do you change your bike setup when you go up or down a hill ?


Yes, every time. I take a lazer level, tape measure and plumb line with me every ride. Some of the guys I ride with find it annoying, but they can't say too much as I crush them up every hill...

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Slowmart
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Re: Setting a bike up for a turbo

Postby Slowmart » Sat Oct 12, 2019 12:26 pm

Is that after you’ve adjusted the geometry on your bike?
And God created the bicycle, so that man could use it as a means for work and to help him negotiate life's complicated journey.

theboyfold
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Re: Setting a bike up for a turbo

Postby theboyfold » Sat Oct 12, 2019 12:49 pm

Slowmart wrote:Is that after you’ve adjusted the geometry on your bike?


Only if I take my MIG welding kit, which is helpful for both mild frame tweaks and resistance training.

Imposter
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Re: Setting a bike up for a turbo

Postby Imposter » Sat Oct 12, 2019 12:49 pm

Poor trolling..

NitrousOxide
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Re: Setting a bike up for a turbo

Postby NitrousOxide » Sat Oct 12, 2019 13:06 pm

If you're only going to use the bike on the turbo over winter, set it up on the turbo.

If you're also going to do some outdoor rides on it over winter, either adjust things each time you ride in/outdoors, or set the bike up for outdoors and find a height for the front wheel off the floor that works for you.
================
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philthy3
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Re: Setting a bike up for a turbo

Postby philthy3 » Sat Oct 12, 2019 21:05 pm

Why is anyone replying to this? The saddle doesn't move in relation to its distance behind the BB just by putting the front wheel on a riser block. The OP is either fishing for bites or a complete idiot.
We're all buffoons; some slightly less than others.

theboyfold
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Re: Setting a bike up for a turbo

Postby theboyfold » Sat Oct 12, 2019 22:51 pm

philthy3 wrote:Why is anyone replying to this? The saddle doesn't move in relation to its distance behind the BB just by putting the front wheel on a riser block. The OP is either fishing for bites or a complete idiot.

Firstly, I'll freely admit that I may have misunderstood something and what I'm seeing is incorrect.
Secondly, I don't appreciate being called a "complete idiot", I've come with what I thought was a reasonable question, and have been treated to a stream of sarcastic replies, which I've stooped to with a couple of my responses.

However, my question still stands, and I'd like to understand what I'm seeing and in which position I should set the bike up.

On both occasions the red line goes through the centre of the BB (click on the image to get a clearer version)

Image

Image

So, what's the difference I'm seeing? What am I missing? Happy to have it explained to me, but if the only answers are rude or sarcastic, I'll rather be left floundering in the darkness for an answer.

Thanks.

PBlakeney
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Re: Setting a bike up for a turbo

Postby PBlakeney » Sat Oct 12, 2019 22:59 pm

I like flounder. Nice fish.
The above may be fact, or fiction, I may be serious, I may be jesting.
I am not sure. You have no chance.

Veronese68 wrote:PB is the most sensible person on here.

Imposter
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Re: Setting a bike up for a turbo

Postby Imposter » Sat Oct 12, 2019 22:59 pm

Still not sure I understand what your issue is, but if by 'set the bike up' you mean 'get the correct fit' - then do that off the turbo, on the flat, using whatever measurements you have. Then put the bike on the turbo, with the front on the riser block if necessary. Apart from that, I'm just not seeing the problem..

theboyfold
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Re: Setting a bike up for a turbo

Postby theboyfold » Sat Oct 12, 2019 23:13 pm

Imposter wrote:Still not sure I understand what your issue is, but if by 'set the bike up' you mean 'get the correct fit' - then do that off the turbo, on the flat, using whatever measurements you have. Then put the bike on the turbo, with the front on the riser block if necessary. Apart from that, I'm just not seeing the problem..

What I'm struggling with, is when I set the bike up on the flat, with the measurements that I need, then transfer it to the trainer and put it on the riser, the measurement in the photos above are different.

My understanding of what the riser does, is that balances out the lift occurs when mounting the bike on the turbo. So why should the measurements be different from when it's on level ground if that's the case? They are the same without the riser as they are on level ground.

Also, the angle of the saddle is out by a couple of degrees, which would further suggest that it's not flat when on the riser.

So there are 3 states
Level ground: Correct
Trainer without riser: Correct
Trainer with riser: Incorrect

Imposter
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Re: Setting a bike up for a turbo

Postby Imposter » Sat Oct 12, 2019 23:19 pm

So use it without the riser. In practice, it won't matter. A couple of degrees or mm here or there is not going to be critical in any way.

I'll say it again though, your fit does not change simply by putting the bike on the turbo. Sorry to say, this really seems like a complete non-issue.

theboyfold
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Re: Setting a bike up for a turbo

Postby theboyfold » Sat Oct 12, 2019 23:25 pm

Imposter wrote:So use it without the riser. In practice, it won't matter. A couple of degrees or mm here or there is not going to be critical in any way.

I'll say it again though, your fit does not change simply by putting the bike on the turbo. Sorry to say, this really seems like a complete non-issue.


No need to apologise, I'm happy for it to be a non issue, it just seemed to contradict what I thought the purpose of the riser block was. I was just surprised when the difference came out at 2cm, which is a fairly decent amount.

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Me-109
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Re: Setting a bike up for a turbo

Postby Me-109 » Sat Oct 12, 2019 23:34 pm

The tip of your saddle is following an arc around the rear wheel axle as you add or remove the front wheel riser block. You can see against the planter in the background the effect this has. The saddle has not moved in relation the the bottom bracket or handlebars. Your relative position is no different.

theboyfold
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Re: Setting a bike up for a turbo

Postby theboyfold » Sun Oct 13, 2019 05:06 am

Me-109 wrote:The tip of your saddle is following an arc around the rear wheel axle as you add or remove the front wheel riser block. You can see against the planter in the background the effect this has. The saddle has not moved in relation the the bottom bracket or handlebars. Your relative position is no different.

Thank you


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