Size

Seat Tube Angle

Head Tube Angle

BB Drop

Top Tube

Head Tube length

Front Center

Rear Center

Stand Over Height

Stack

Reach

48

73

72.5

68

514

100

547

405

710

501

360

51

73

73

68

530

120

558

405

730

521

371

54

73

73

68

545

140

573

405

745

540

380

56

73

73

68

564

160

593

405

765

560

393

58

73

73

68

580

180

608

405

780

581

402

61

73

73

68

592

200

620

405

801

600

410

 

Neuvaiton frames have a different geometry than most and as a result will fit people better.  I use about the same geometry as one of the bike suppliers of one of the leading Pro Tour teams and they have never had to make a custom frame for any of their riders.  The chances are excellent that a Neuvation frame will fit you perfectly too.

What’s different?  All my seat tube angles are 73 degrees and parallel to the head tube (except for the 48).  This results in a reach (far right column above) that has good consistent length changes between the models.

Almost all other companies make seat tubes that are much steeper for the smaller frames and less steep for the larger ones.   That effectively “pushes forward” the top tube on the small frames and” brings it back” on the large ones (with less steep seat tube angles) so the reach changes are at best inconsistent and at worse make it impossible to fit the bike properly.

Why is reach more important than effective top tube length that almost everyone else uses?  The bike fits you in three places.  The seat, pedals, and handlebars.  The saddle position is a direct result of where the pedals are (all bike fit instructions locate the saddle based on pedal position).  It’s going to be where it is no matter what frame geometry you have.  So the critical length dimension in the bike is the distance from the center of the bottom bracket ( where the pedals are attached) to the center of the head tube – or Reach.  Who cares how long the effective top tube is when it’s has little to do with how far forward the bars are going to be?

Isn’t it possible to position the handlebars correctly with different stem lengths and angles?  Usually yes but not always.  In any case it’s always better to have more options than less.

Below are two examples.  The first is the Neuvation 48 CM frame


Note that the reach is the difference between the effective top tube length and the set back from the center of the BB set to the center of the seat post.  For the 48 Neuvation the reach is 366 mm (512 - 146).

The next drawings is from a very well known high end bike company.


The reach on this 49 CM bike is 395 or about 30 mm longer than the Neuvation or about the reach on a Neuvation 58 CM bike!  The seat tube angle on this model is 75.5 degrees.  On their bigger bikes it’s 72 degrees.   For these reasons it's very common for my competitors to have small frames that are too long and large frames that are too short - even though the effective top tube lengths appear to be proportional to the frame size.