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PostPosted: Fri Aug 29, 2014 9:24 pm 
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Joined: Sat Nov 24, 2012 8:43 pm
Posts: 13
Hey guys,

I am hoping for some advice on comparing a few different bikes. Am I right in saying that I should ignore top tube length as when looked at without considering seat tube angle mis dimension can be misleading. To get a more practical idea of what my position will be I should be comparing stack & reach therefore?

The bike I am considering is a 2015 Specialized S-Works Tarmac in either a 56cm or 58cm (note I am 187cm tall, 79kg, 78.3cm bb venter-saddle top), flexible, have put in 7000km so far this year).

Currently I have 2 bikes & happy with fit on both:

Scott CR1SL (2012) 58cm
Stack 603mm (no spacers under stem & could comfortably drop 1-2cm further tomorrow).
Reach 394mm + 110mm stem= 504mm

Canyon Inflite AL (2014) 58cm
Stack 590mm (ride with 25mm of spacers as that is how the bike came set up & it's my winter bike)
Reach 388mm + 120mm stem= 508mm

& now it is between the 2 sizes of Tarmac I need help with:

Specialized S-Works Tarmac (2015) 56cm
Stack 564mm
Reach 395mm + 110mm stem= 505mm

58cm
Stack 591mm
Reach 402 + 100mm stem= 502mm

So, when you look at it I could ride the 58cm with the stem slammed & a 100m stem (is that so short as to muck up the handling)
or
Ride the 56cm but with probably 2cm of spacers under the stem.

Thoughts?

Cheers!!

pete


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PostPosted: Sun Aug 31, 2014 12:11 pm 
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Joined: Wed Apr 11, 2012 3:40 am
Posts: 394
Slam the 58. I wouldn't worry about the handling.


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PostPosted: Sun Aug 31, 2014 3:46 pm 
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Joined: Wed Sep 26, 2007 1:57 pm
Posts: 7334
Location: San Francisco, CA
100 mm stem won't affect handling.

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PostPosted: Mon Sep 01, 2014 1:18 am 
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Joined: Wed Jun 02, 2010 7:00 am
Posts: 55
Rides 7000km so far this year. Wants to ride a bike with a lower bar drop than 180cm Chris Horner who rides a H2 Madone 56cm. 17cm head tube on that bad boy + spacers.

http://www.bikeradar.com/au/gear/articl ... toc-30223/

Get the 58 or 61cm. You will breathe better on the climbs.

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PostPosted: Mon Sep 01, 2014 1:43 am 
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Joined: Wed Jun 01, 2011 7:53 am
Posts: 290
Chris Horner, the same guy who rides with a full size pump and saddle bag on training, is not exactly a benchmark for a fit. He is on the top edge of the comfort fit scale. That said, there is a large gap between the 56 and 58 stack on the tarmac. I agree that you will breathe easier with a more open and upright fit, but making it a reach can really numb the handling. Not just because of the stem length, but the overall length, wheelbase, slacker STA, etc. It's like driving a caravan vs. a sports car. I think I'd go with the 58 if I were you and that will leave you some wiggle room up or down.

Btw, durianrider - I get a huge kick out of your videos. Also good job on the strava distance challenges.


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